Q&A - PSLE Math

[MathIzzzFun]

2632parent:

Kindly help me with this question


1) Gerald had 60 sweets more than Herlina. After eating half of what they had, the ratio of the number of Gerald's sweets to the number of Herlina's sweets became 3:2.
a) How many sweets did Gerald eat?
b) Gerald gave Herlina some sweets and the ratio became 8:7. How many sweets did Gerald give Herlina?

Thank you

After both ate half their sweets, Gerald's sweets : Herlina's sweets --> 3u : 2u
At first, Gerald's sweets : Herlina's sweets --> 6u : 4u
Gerald had 60 sweets more than Herlina,
2u --> 60
1u --> 30

after eating half of their sweets,
Gerald's sweets --> 3 x 30 = 90
Herlina's sweets --> 2 x 30 = 60
Total --> 150

After giving Herlina some sweets,
Gerald's sweets --> 8/15 x 150 = 80

Number of sweets given to Herlina --> 90 - 80 = 10

cheers.

[2632parent]

:thankyou: Thank you both david59 and MathIzzzFun for your reply. Is my dd homework and he very thankful to both of you. :thankyou:

[superksmum]

Oldschool:

superksmum:

Mrs Tan had 130 apples and oranges. After she sold 2/3 of the apples and 2/5 of the oranges, she had 36 more oranges than apples left. How many fruits had she left in all?

Hi,

Thanks for the clarification.

In case you still need the MD approach,

http://i42.tinypic.com/6ruh4z.jpg\">

Regards[/quote]

Hi oldschool,

Thank you so much for your assistance.

[soonlee.012396ng.012396resources-sg.012396com]

Joining this thread

[Mary Joy]

please help me with these questions thank you


1.at first John had some money.he spent 1/4 of it on a t-shirt and 2/5 of the remainder on a pair of shoes.After that,his parents gave him $120.The ratio of the total amount of money he had at the end to the amount of money he had at first was 5:4.How much money did John have at first?

2.Jim bought some chocolates and gave half of them to ken.ken bought some sweets and gave half of them to Jim.Jim ate 12 sweets and ken ate 18 chocolates.after that the Number of sweets and chocolates Jim had were in the ratio 1:7 and the number of sweets and chocolates ken had were in the ratio. 1:4

How many sweets did ken buy?

[MathIzzzFun]

Mary Joy:

please help me with these questions thank you



2.Jim bought some chocolates and gave half of them to ken.ken bought some sweets and gave half of them to Jim.Jim ate 12 sweets and ken ate 18 chocolates.after that the Number of sweets and chocolates Jim had were in the ratio 1:7 and the number of sweets and chocolates ken had were in the ratio. 1:4

How many sweets did ken buy?

http://www.flickr.com/photos/mathizzzfun/8196644004/in/set-72157632037121311/

similar question :
http://www.flickr.com/photos/mathizzzfun/6943541872/in/set-72157632928079102

cheers.

[MathIzzzFun]

Mary Joy:

please help me with these questions thank you


1.at first John had some money.he spent 1/4 of it on a t-shirt and 2/5 of the remainder on a pair of shoes.After that,his parents gave him $120.The ratio of the total amount of money he had at the end to the amount of money he had at first was 5:4.How much money did John have at first?

How many sweets did ken buy?

At first, John's money --> 20 units
Amount left after buying shoes --> 3/5 x 3/4 x 20 units = 9 units

In the end, John's money --> 9 units + $120

John's money, in the end : at first = 5 : 4 --> 25 units : 20 units

so, 9 units + $120 = 25 units
1 unit --> $ 7.50

John's money, at first --> 20 x $ 7.50 = $ 150

cheers.

[Chalupa]

Hi please help to solve this problem.

There were 1600 pupils in a primary school. When the number of boys increased by 76 and the number of girls decreased by 4% , the total enrollment in the school increased by 3%. How many boys were in the school at first…
Thanks in advance.

[tianzhu]

Chalupa:

Hi please help to solve this problem.

There were 1600 pupils in a primary school. When the number of boys increased by 76 and the number of girls decreased by 4% , the total enrollment in the school increased by 3%. How many boys were in the school at first..
Thanks in advance.

Hi

It helps to start with a simple diagram.

1.03*1600 ----- 1648

76 – 48 ------ 28

4% of girls ------- 28

1% of girls ------- 7

100% of girls ------- 700

Number of boys@first ------- 900

Best wishes

[PiscesLeo]

Posted this in P5 thread but there’s no reply so hope to get help here.


Tank A and tank B are identical. 5/6 of tank A and 1/4 of tank B are filled with water. The mass of tank B with its contents is 7/13 of the mass of tank A with it’s contents. The total mass of the two tanks with their contents is 1400g. Find the mass of the empty tank.

Thank you very much