Q&A - PSLE Math

[jieheng]

YumYum:

Hi, can anyone pls help with these qns:


1) there were 900 more chocolates than lollipops in a candy shop.
After the shop ordered more lollipops and sold some chocolates, the number of lollipops increased by 20% and the number of chocolates decreased by 30%.

Given that there were 370 more lollipops than chocolates in the end, find the total number of chocolates and lollipops in the shop at first.


Thanks 

1)

At first
C 10u + 900
L 10u

the number of chocolates decreased by 30% --> - (3u + 270)

the number of lollipops increased by 20% --> + 2u

C 10u + 900 - (3u + 270) --> 7u + 630

L 10u + 2u --> 12u

Given that there were 370 more lollipops than chocolates in the end

12u - (7u + 630) --> 370
5u --> 1000
1u --> 200

the total number of chocolates and lollipops in the shop at first

20u + 900 --> 20*200 + 900 = 4900 (Ans)

[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.