Q&A - PSLE Math

[jieheng]

YumYum:

Hi, can anyone pls help with these qns:



2) Sonia has some money to buy some photo albums and photo frames.
If she buys 7 similar photo albums and 3 similar photo frames, she will be short of $27.10.

If she buys 2 similar photo albums and 5 similar photo frames, she will have $19 left.

If a photo frame costs $8.20, how much money does Sonia have?

Thanks 

If she buys 7 similar photo albums and 3 similar photo frames, she will be short of $27.10

3 similar photo frames --> 3*8.2 = 24.6

If she buys 7 similar photo albums only , she will be short of $2.50
(27.1 - 24.6 = 2.5)

If she buys 2 similar photo albums and 5 similar photo frames, she will have $19 left.

5 similar photo frames --> 5*8.2 = 41

If she buys 2 similar photo albums only, she will have $60 left.
(19 + 41 = 60)

Price of one photo album = (2.5+60)/5 = 12.5

the money that Sonia has = 2*12.5 + 5*8.2 + 19 = 85 (Ans)

[YumYum]

Jieheng, thanks for the help 

[Jolyn]

55% of the spectators at a football game were men. 4/5 of the remaining spectators were women and the rest were children.

A)How many percent of the spectators were women?
B)How many percent of the spectators were children?

[tianzhu]

Jolyn:

55% of the spectators at a football game were men. 4/5 of the remaining spectators were women and the rest were children.

A)How many percent of the spectators were women?
B)How many percent of the spectators were children?

Hi

Men ------ 55%

45% remaining

Women ------- 4/5 of 45% ------- 36%

Children ------- 1/5 of 45% ------ 9%

Best wishes

[imacsg]

Can anyone help? Thanks.

A shop sold cupcakes at $2.50 each and tarts at $5.30 each. Apple bought some cupcake while Mark bought some tarts. Mark spent $5.20 more than Apple but bought 8 fewer items than her.

How many tarts did Mark buy?
How much money did Apple spend?

[MathIzzzFun]

imacsg:

Can anyone help? Thanks.

A shop sold cupcakes at $2.50 each and tarts at $5.30 each. Apple bought some cupcake while Mark bought some tarts. Mark spent $5.20 more than Apple but bought 8 fewer items than her.

How many tarts did Mark buy?
How much money did Apple spend?

assume that Mark bought same number of tarts --> 8 more
8 x $5.30 = $42.40
$42.40 + $5.20 = $47.60 --> Mark would have spent $47.60 more than Apple he bought same number of tarts as cupcakes bought by Apple.

$5.30 - $2.50 = $ 2.80 --> 1 tart cost $ 2.80 more than a cupcake.
Number of cupcakes bought by Apple = $47.60 / $ 2.80 = 17
Apple spent --> 17 x $2.50 = $42.50
Number of tarts bought by Mark = 17 - 8 = 9

cheers.

[imacsg]

Thanks for your help.

[bluie79]

Hi


Does anyone know how to solve this question? My niece asked me and I cant seem to solve it. The question goes like this:

Pearly had 20% more marbles than Sandy. Then Pearly gave away 30% of her marbles to her sister. Sandy received 65 marbles from Joe. As a result, Sandy now had 26% more marbles than Pearly. How many marbles did Pearly have at first?
Thanks a Mil!!

bluie79

[MathIzzzFun]

bluie79:

Hi


Does anyone know how to solve this question? My niece asked me and I cant seem to solve it. The question goes like this:

Pearly had 20% more marbles than Sandy. Then Pearly gave away 30% of her marbles to her sister. Sandy received 65 marbles from Joe. As a result, Sandy now had 26% more marbles than Pearly. How many marbles did Pearly have at first?
Thanks a Mil!!

bluie79

pls check the highlighted figure - is this supposed to be 25% ?

cheers.

[happyheart]

MathIzzzFun:

happyheart:

Hi, one more please. I am always confused when there is transfer back and forth.Thanks.


Jack and Aqil had some game cards. If Jack gave Aqil 52 cards, he would have the same number of cards as Aqil. If Aqil gave Jack 34 cards, the ratio of the number of cards Aqil had to the number of cards Jack had would be 3:7.How many cards did Jack have at first?

If Jack gave Aqil 52 cards, he would have the same number of cards as Aqil
--> Jack has 52 x 2 = 104 more cards than Aqil at first.

If Aqil gave Jack 34 cards,
--> Jack would have 104 + 34 x 2 = 172 more cards than Aqil

So, 4u --> 172, 1u --> 43
Number of cards Jack has at first = 7 x 43 - 34 = 267

cheers.

Thank you, MathIzzzFun.