Q&A - PSLE Math

[2632parent]

Many thanks to you kaisugrandmaster. The explainations is very clear.

[tianzhu]

charsen:

Can anyone help with this question.


85 Children are divided into groups for a science project.Each group is made up of 2 or 3 children.If the number of groups of 2 and 3 children are the same,how many groups are there altogether?

Hi

You’ve just revised your question.

Number of groups ------- 85/ (2+3) ------ 17

Altogether there are 17*2 or 34 groups.

Best wishes

[charsen]

charsen:

Can anyone help with this question.


85 Children are divided into groups for a science project.Each group is made up of 2 or 3 children.If the number of groups of 2 and 3 children are the same,how many groups are there altogether?

My working is this:
For every group2 children,there is a group3.
no.of pairs of group 2,3----> 85/5=17
total no. of groups-------->17x2=34(ANS)

[tianzhu]

charsen:

total no. of groups-------->17x2=34(ANS)

Hi

Yes, you're correct.

The total number of groups is 34(17*2).

Best wishes

[isetan]

Hi, need help on this question.


Container P contains 250 red and 200 marbles. Container Q contains 600 red and 150 blue marbles. How many red and how many blue marbles must be moved from Container P to Container Q so that 25% of the marbles in Container P and 75% of marbles in Container Q are red?
TIA

[MathIzzzFun]

isetan:

Hi, need help on this question.


Container P contains 250 red and 200 marbles. Container Q contains 600 red and 150 blue marbles. How many red and how many blue marbles must be moved from Container P to Container Q so that 25% of the marbles in Container P and 75% of marbles in Container Q are red?
TIA

Hi

here are some similar questions.. hope it helps..

http://www.flickr.com/photos/62167097@N02/sets/72157629537287046/

http://www.flickr.com/photos/62167097@N02/7285193834/in/set-72157629537287046

http://www.flickr.com/photos/62167097@N02/7080366811/in/set-72157629537287046

cheers.

[isetan]

MathIzzzFun:

isetan:

Hi, need help on this question.


Container P contains 250 red and 200 marbles. Container Q contains 600 red and 150 blue marbles. How many red and how many blue marbles must be moved from Container P to Container Q so that 25% of the marbles in Container P and 75% of marbles in Container Q are red?
TIA

Hi

here are some similar questions.. hope it helps..

http://www.flickr.com/photos/62167097@N02/sets/72157629537287046/

http://www.flickr.com/photos/62167097@N02/7285193834/in/set-72157629537287046

http://www.flickr.com/photos/62167097@N02/7080366811/in/set-72157629537287046

cheers.

Many thanks!

[Neat]

Hi


Please help with these 2 questions:

1. Susan has some vanilla and chocolate sweets in her bag. If she adds 20 vanilla sweets into the bag, the percentage of vanilla sweets in the bag becomes 40%. If she adds 30 chocolate sweets, there will be 70% of chocolate sweets in the bag. How many vanilla and chocolate sweets does she have?

2. Mr Samad made some toys to sell. He sold 20% of the toys on Monday. He sold 27 toys on Tuesday. On Wednesday he sold 10% of the remaining toys. After that he found that the toys he had left was 1 more than 1/2 the number of toys he had made. How many toys did he made?

Thank You.

[MathIzzzFun]

Neat:

Hi


Please help with these 2 questions:

1. Susan has some vanilla and chocolate sweets in her bag. If she adds 20 vanilla sweets into the bag, the percentage of vanilla sweets in the bag becomes 40%. If she adds 30 chocolate sweets, there will be 70% of chocolate sweets in the bag. How many vanilla and chocolate sweets does she have?

Thank You.

Hi

Q1
if 20 vanilla sweets added,
Vanilla : Chocolate = 40: 60 --> 2u : 3u
total Vanilla : Chocolate --> 2u - 20 : 3u

If 30 chocolate added,
Vanilla : Chocolate --> 2u-20 : 3u+30 = 3:7

cross multiply/equalize,
14u - 140 = 9u+90, 1u--> 46

Vanilla --> 2x46 - 20 = 92
Chocolate --> 3 x 46 = 138

cheers.

[MathIzzzFun]

Neat:

Hi


Please help with these 2 questions:


2. Mr Samad made some toys to sell. He sold 20% of the toys on Monday. He sold 27 toys on Tuesday. On Wednesday he sold 10% of the remaining toys. After that he found that the toys he had left was 1 more than 1/2 the number of toys he had made. How many toys did he made?

Thank You.

Hi

Could you check the source of the question, while the answer is a whole number (115), it does not make sense because (1/2 of 115 + 1) is not a whole number.

cheers.