Q&A - PSLE Math

[kwcllf]

Michaelia0816:

jarenchuatw:

Need help in solving these 2 questions:


Q1 Hock and Mei live in the same block of flat. There are 84 steps from the first level to the foruth level. Hock lives in the first level. How many steps must he climb to get from his flat to Mei's flat which is on the 8th level (There are the same number of steps between each level).

Note: We got the answer as 168 but that was wrong - the correct answer is 196 (why huh?)

Q2 pls refer to the image attached

For Q1 , mine is same as your, you're correct, it took 21 steps to get to another level, so times 8 is equal to 168.

Each level has 28 steps (84/3 not 84/4) although there are 4 levels.

To climb up to Mei's flat on the 8th floor ---> 28 steps x 7 = 196 steps

Every 2 levels, there are only 28 steps. You only need to climb 1 level to reach the second level.
So, for the 8th level, multiply by 7, not 8

[Spongy]

Hi I need help in a question. :thankyou:


1. Charlie and Diana had some stamps. Charlie had 70% of what Diana had at first. Charlie then gave Diana 60% of what he had. As a result, Diana had 912 more stamps than Charlie. How many stamps did Charlie have at first?

[MathIzzzFun]

Spongy:

Hi I need help in a question. :thankyou:


1. Charlie and Diana had some stamps. Charlie had 70% of what Diana had at first. Charlie then gave Diana 60% of what he had. As a result, Diana had 912 more stamps than Charlie. How many stamps did Charlie have at first?

Hi

At first,
Diana --> 50 units
Charlie --> 35 units, 30% of Charlie's stamps --> 21 units

In the end,
Diana --> 71 units }
Charlie --> 14 units } difference = 57 units
57 units --> 912
1 unit --> 16
35 x 16 = 560, Charlie had 560 stamps at first.

cheers.

[Bunny27]

MathIzzzFun:

Spongy:

Hi I need help in a question. :thankyou:


1. Charlie and Diana had some stamps. Charlie had 70% of what Diana had at first. Charlie then gave Diana 60% of what he had. As a result, Diana had 912 more stamps than Charlie. How many stamps did Charlie have at first?

Hi

At first,
Diana --> 50 units
Charlie --> 35 units, 30% of Charlie's stamps --> 21 units

In the end,
Diana --> 71 units }
Charlie --> 14 units } difference = 57 units
57 units --> 912
1 unit --> 16
35 x 16 = 560, Charlie had 560 stamps at first.

cheers.

Hi, someone pls help on this question:


1) Jack, Kristine and Lina painted some chairs for their school classrooms. Jack painted ½ of the numbers of the chairs.
Kristine and Lina painted the remaining number of chairs in the ratio of 3:5.
Jack painted 65 more chairs than Kristine.
(a) How many chairs did Jack and Lina paint together?
(b) The school would save $4 for every chair painted, what was the total savings for the school?

Thank you!

[isetan]

atutor2001:

isetan:

Thanks atutor2001,

Your brain is not decaying but rather an active one. Thanks for the ans.

Sorry, confirmed chopped chopped that my brain is decaying. My answer is wrong. What I have given was the total number of chairs and not the \"chairs arranged in row\".

So the correct answer is :
1 part (1/14) of total chair = 1 short row +32 = 16 + 32 = 48
Total chairs in rows = 14 - 1=13 parts = 48 x 13 =624

MathIzzFun's answer is the correct one. :salute:

Hi atutor2001, anyway good try, at least better than I...total decayed.

[Andrew Lee]

quote=\"MathIzzzFun\"]

Spongy:

Hi I need help in a question. :thankyou:


1. Charlie and Diana had some stamps. Charlie had 70% of what Diana had at first. Charlie then gave Diana 60% of what he had. As a result, Diana had 912 more stamps than Charlie. How many stamps did Charlie have at first?

Hi

At first,
Diana --> 50 units
Charlie --> 35 units, 30% of Charlie's stamps --> 21 units

In the end,
Diana --> 71 units }
Charlie --> 14 units } difference = 57 units
57 units --> 912
1 unit --> 16
35 x 16 = 560, Charlie had 560 stamps at first.

cheers.[/quote]


Hi, someone pls help on this question:


1) Jack, Kristine and Lina painted some chairs for their school classrooms. Jack painted ½ of the numbers of the chairs.
Kristine and Lina painted the remaining number of chairs in the ratio of 3:5.
Jack painted 65 more chairs than Kristine.
(a) How many chairs did Jack and Lina paint together?
(b) The school would save $4 for every chair painted, what was the total savings for the school?

Thank you![/quote]


Hello,
I got 3 questions need you guy help pls :

http://i47.tinypic.com/t7cw36.jpg\">

http://i49.tinypic.com/rhrjo2.jpg\">

http://i48.tinypic.com/iqkncx.jpg\">

[Andrew Lee]

Andrew Lee:

quote=\"MathIzzzFun\"]

Spongy:

Hi I need help in a question. :thankyou:


1. Charlie and Diana had some stamps. Charlie had 70% of what Diana had at first. Charlie then gave Diana 60% of what he had. As a result, Diana had 912 more stamps than Charlie. How many stamps did Charlie have at first?

Hi

At first,
Diana --> 50 units
Charlie --> 35 units, 30% of Charlie's stamps --> 21 units

In the end,
Diana --> 71 units }
Charlie --> 14 units } difference = 57 units
57 units --> 912
1 unit --> 16
35 x 16 = 560, Charlie had 560 stamps at first.

cheers.

Hi, someone pls help on this question:


1) Jack, Kristine and Lina painted some chairs for their school classrooms. Jack painted ½ of the numbers of the chairs.
Kristine and Lina painted the remaining number of chairs in the ratio of 3:5.
Jack painted 65 more chairs than Kristine.
(a) How many chairs did Jack and Lina paint together?
(b) The school would save $4 for every chair painted, what was the total savings for the school?

Thank you![/quote]


Hello,
I got 3 questions need you guy help pls :

http://i49.tinypic.com/rhrjo2.jpg\">

http://i48.tinypic.com/iqkncx.jpg\">[/quote]

http://i47.tinypic.com/t6uxyq.jpg\">

[kiasuaunt]

Andrew Lee:

Andrew Lee:

quote=\"MathIzzzFun\"][quote=\"Spongy\"]Hi I need help in a question. :thankyou:


1. Charlie and Diana had some stamps. Charlie had 70% of what Diana had at first. Charlie then gave Diana 60% of what he had. As a result, Diana had 912 more stamps than Charlie. How many stamps did Charlie have at first?

Hi

At first,
Diana --> 50 units
Charlie --> 35 units, 30% of Charlie's stamps --> 21 units

In the end,
Diana --> 71 units }
Charlie --> 14 units } difference = 57 units
57 units --> 912
1 unit --> 16
35 x 16 = 560, Charlie had 560 stamps at first.

cheers.

Hi, someone pls help on this question:


1) Jack, Kristine and Lina painted some chairs for their school classrooms. Jack painted ½ of the numbers of the chairs.
Kristine and Lina painted the remaining number of chairs in the ratio of 3:5.
Jack painted 65 more chairs than Kristine.
(a) How many chairs did Jack and Lina paint together?
(b) The school would save $4 for every chair painted, what was the total savings for the school?

Thank you![/quote]
Hello,
I got 3 questions need you guy help pls :

http://i49.tinypic.com/rhrjo2.jpg\">

http://i48.tinypic.com/iqkncx.jpg\">[/quote]

http://i47.tinypic.com/t6uxyq.jpg\">[/quote]

Hi - the last 2 questions look very familiar - my dd did it before - was going thru her file to doublecheck the ans - maybe u can tell me which exam paper ( Henry Park )?

[Neat]

tianzhu:

Neat:

Thanks a lot, tianzhu.

If unit method is to be used, which item is to be made constant?

Regards

Hi

Good Morning.

I am trying to understand “which item is to be made constant”. Could you help to elaborate on it?

Alternatively, you may also present the solution in “Units and Parts”.

The relationship between Edward and Sam is given.

Edward ------ 4 units
Sam ------- 3 units

We differentiate between Edward/Sam and Jason by using parts for Jason.

1 unit + 1 part ------- 837 – 648 ------- 189

3 units + 3 parts ------ 3*189 ------ 567 (total amount)

Sam’s money@first ------- 837 – 567 ------- 270

3 units ------- 270
1 unit ------- 90

Therefore, Edward’s money@first ------- 4*90 ------ 360

837 – 360 – 270 ------ 207 (Jason’s money@first)

Best wishes

[quote]Thanks tianzhu[/quote]

[AJH]

Hi -


Q. Jane and May share a box of beads. If Jane were to give 25% of her share to May, Jane would have half of May’s final share. If Jane were to give 16 beads to May, Jane would have 54 fewer beads than May. If they were to pack all their beads into boxes of 25 each, what is the least number of boxes required to pack all of them?

Thank you.