Q&A - PSLE Math

[bcmum]

Thank u..

Q : The number of children increased by 15 to 35 at a party. What was the percentage increase in the number of children?

We are confused with the wording... increased by... increased to... what is the different?

Thks.

When we ask what's the percentage increase or decrease, it is usually reference to the original number. The number that it began with.

In this case,
the original number is 20.
It increase by 15.
It increased to 35.

Reference to original number 20, the percentage increase is (15/20) X 100 = 75%.
So it increased by 75%.

[bcmum]

Pls help..
The avg age of Elvin's friends was 11 years old. Elvin was 7 years old. After Elvin joined the group, the avg age became 10 years old. How many children were there in the group after Elvin joined in?

Thks.

[jojoberry]

Pls help..
The avg age of Elvin's friends was 11 years old. Elvin was 7 years old. After Elvin joined the group, the avg age became 10 years old. How many children were there in the group after Elvin joined in?

Thks.

Since Elvin is only 7, he gained 3 years to get an avg of 10.
10-7 = 3
11-10 = 1
3 / 1 = 3
3 + 1 = 4
So total 4 children in the group.

[Sruthi]

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[Ender]

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