Q&A - PSLE Math

Academic support for Primary 6 and PSLE
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Bunnyng
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Re: Q&A - PSLE Math

Post by Bunnyng » Sat Mar 26, 2016 8:10 pm

Thank you for your kindness Icewatch!

numeric
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Re: Q&A - PSLE Math

Post by numeric » Sun Mar 27, 2016 3:27 pm

Bunnyng wrote:Can anyone help? Thank you!

A coin box contained only twenty-cent and fifty-cent coins in the ratio of 4:5. When 16 fifty-cent coins were taken out and replaced by some twenty-cent coins, the number of fifty-cent coins left in the box was 7/8 of the twenty-cent coins. The total value of all the coins remained the same. Find the sum of money in the coin box. (Ans $112.20)
Another explanation:
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SOS mum
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Re: Q&A - PSLE Math

Post by SOS mum » Mon Mar 28, 2016 7:14 pm

Ps help the following qns. Many tks and God Bless:)

(1) Alice, Betty and Charlotte had a total of 640 marbles at first. The ratio of Betty's marbles to Charlotte's marbles was 5:4. After Alice and Betty each had lost 50% of their marbles, the three girls had 440 marbles. How many marbles did Alice have at first?

(2) Miss Tang bought 164 strawberry and orange sweets altogether. They were repacked into two boxes, A and B. The ratio of the number of strawberry sweets in Box A to that in Box B was 3:2. The number of orange sweets in Box A was 1/3 as many as that in Box B. If there were 40 more sweets in Box B than A, how many strawberry sweets were there in Box A?

BigDevil
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Re: Q&A - PSLE Math

Post by BigDevil » Tue Mar 29, 2016 3:57 pm

SOS mum wrote:Ps help the following qns. Many tks and God Bless:)

(1) Alice, Betty and Charlotte had a total of 640 marbles at first. The ratio of Betty's marbles to Charlotte's marbles was 5:4. After Alice and Betty each had lost 50% of their marbles, the three girls had 440 marbles. How many marbles did Alice have at first?
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BigDevil
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Re: Q&A - PSLE Math

Post by BigDevil » Tue Mar 29, 2016 6:05 pm

SOS mum wrote:Ps help the following qns. Many tks and God Bless:)

(2) Miss Tang bought 164 strawberry and orange sweets altogether. They were repacked into two boxes, A and B. The ratio of the number of strawberry sweets in Box A to that in Box B was 3:2. The number of orange sweets in Box A was 1/3 as many as that in Box B. If there were 40 more sweets in Box B than A, how many strawberry sweets were there in Box A?
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SOS mum
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Re: Q&A - PSLE Math

Post by SOS mum » Tue Mar 29, 2016 7:55 pm

Hi, ps help. Many tks and God Bless:)

In a swimming club, the ratio of the number of girls to the number of boys was 5:3. After 3 girls and 5 boys joined the club, the ratio became 7:5. How many girls were there in the club at first?

sushi88
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Re: Q&A - PSLE Math

Post by sushi88 » Tue Mar 29, 2016 8:40 pm

SOS mum wrote:Hi, ps help. Many tks and God Bless:)

In a swimming club, the ratio of the number of girls to the number of boys was 5:3. After 3 girls and 5 boys joined the club, the ratio became 7:5. How many girls were there in the club at first?
G : B
5u : 3u

After adding more children,
G : B
5u+3 : 3u+ 5
7 : 5

So (5u+3) / (3u+5) = 7/5
5(5u+3) = 7(3u+5)
25u + 15 = 21u+35
4u = 20
u = 5

Girls at first = 5u = 5 x 5 = 25

SOS mum
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Re: Q&A - PSLE Math

Post by SOS mum » Tue Mar 29, 2016 10:32 pm

Tks Sushi88
However, when i used the same concept for the following qn, it cldnt solve. Ps help. Tks and God Bless:)

The ratio of the number of muffins to the number of pies in a bakery was 4:1. After another 63 muffins and 46 pies were baked, the ratio became 3:1. How many muffins and pies were there in the bakery at first?

SOS mum
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Re: Q&A - PSLE Math

Post by SOS mum » Tue Mar 29, 2016 10:43 pm

Ps help the following qns. Many tks and God Bless:)

(1) The total number of game cards that Fandi and Geetha had was the same as the number that Eugene had. The total number of game cards that Eugene and Geetha had was 5 times the number that Fandi had.
(a) What was the ratio of the number of game cards that Eugene had to the number of game cards that Geetha had to the number of game cards that Fandi had?
(b) Eugene had 118 game cards more than Fandi. How many game cards did the 3 children have altogether?

(2) Jason and Ricky have 276 marbles altogether. 1/4 of Jason's marbles is 15 more than 1/5 of Ricky's marbles.
(a) How many marbles does each boy have?
(b) Find the ratio of the number of Ricky's marbles to the number of Jason's marbles.

(3) A group of people visited a museum. The admission tickets were $2 for an adult and $0.50 for a child. If the ratio of the number of people to the amount of money collected (in dollars) for admission was 7:8, what fraction of the people were adults?

numeric
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Re: Q&A - PSLE Math

Post by numeric » Wed Mar 30, 2016 1:29 am

SOS mum wrote: The ratio of the number of muffins to the number of pies in a bakery was 4:1. After another 63 muffins and 46 pies were baked, the ratio became 3:1. How many muffins and pies were there in the bakery at first?
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