## Q&A - PSLE Math

Academic support for Primary 6 and PSLE
fxchow
GreenBelt
Posts: 144
Joined: Mon Jan 12,
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Hi,

Can someone help to solve this question. TIA.

James had some fishes in a tank. 15 were goldfish and the rest were guppies and angelfish.
The ratio of the number of goldfish to the number of guppies was 3:2 and the ratio of the number of guppies to the number of angelfish was 1:5. If James added 24 fish into the tank, the number of guppies would increase by 50%, and the angelfish would increase by 40%.

P/S: My girl told me that the question got mistake, please see if you can solve it. Question from school with no answer provided.

Dharma
BlackBelt
Posts: 954
Joined: Mon Apr 06,
fxchow wrote:Hi,

P/S: My girl told me that the question got mistake, please see if you can solve it. Question from school with no answer provided.
You girl is right.

Tang
BlueBelt
Posts: 297
Joined: Sat Jun 13,
Dharma wrote:
tianzhu wrote:Hi, hope this helps.
This is small add on to Tianzhu's brilliant illustration.

3 u = 2 p

1 p = 1 u + 1
2 p = 2 u + 2

3 u = 2 u + 2

1 u = 2; 1 p = 3

fxchow
GreenBelt
Posts: 144
Joined: Mon Jan 12,
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Dharma wrote:
fxchow wrote:Hi,

P/S: My girl told me that the question got mistake, please see if you can solve it. Question from school with no answer provided.
You girl is right.
Hi Dharma,

enoawng
OrangeBelt
Posts: 57
Joined: Tue Jul 28,
can anyone help?

John was n years old when his mother was 36 years old. Today, his mother is 3 times as old as John.
a) Express John’s age now in terms of n
b) What is John’s age now if n=8?

Dharma
BlackBelt
Posts: 954
Joined: Mon Apr 06,
enoawng wrote:can anyone help?

John was n years old when his mother was 36 years old. Today, his mother is 3 times as old as John.
a) Express John’s age now in terms of n
b) What is John’s age now if n=8?

KiasuNewbie
Posts: 7
Joined: Sun Jul 06,
Sandy bought some apples and oranges. The number of apples was 1 ¼ times the number of oranges. After she packed the apples into boxes of 10 and oranges into boxes of 6, she found that she had 2 more boxes of oranges than apples. How many apples did she buy at first?

Priskhipo
YellowBelt
Posts: 21
Joined: Sat Sep 13,
David Koriadi wrote:Sandy bought some apples and oranges. The number of apples was 1 ¼ times the number of oranges. After she packed the apples into boxes of 10 and oranges into boxes of 6, she found that she had 2 more boxes of oranges than apples. How many apples did she buy at first?

3greatkids
OrangeBelt
Posts: 58
Joined: Mon Jul 20,
enoawng wrote:can anyone help?

John was n years old when his mother was 36 years old. Today, his mother is 3 times as old as John.
a) Express John’s age now in terms of n
b) What is John’s age now if n=8?
a) John's age now is (36-n)/2.
The theory is that the difference between mother's age and john's age never change, therefore, the difference in their age is always 36-n.
In order for the mother to be 3 times as old as John, when u draw the model, John will be 1 unit whereas mum is 3 units. their age difference(36-n) will then take up 2 units and john's age would be 1 unit. so in order to find 1 unit, you will take (36-n)/2

b) thus john's age now is (36-8)/2 which is 14

James Ang
KiasuGrandMaster
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