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primary 6 | Maths | Percentage
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Brayden
Brayden

primary 6 chevron_right Maths chevron_right Percentage chevron_right Singapore

Please teach me. Thank you

Date Posted: 4 years ago
Views: 306
J
J
4 years ago
Let boys at first = 10units

After 20% increase = 12units

Let girls be 10parts

After 10% decrease = 9parts

9 parts = 12 units.

Since the number of boys and girls are equal, we make the units/parts the same.

9 parts x 4 = 36 parts
12 units x 3 = 36 units

So boys last year = 10 units x 3 = 30 units
Girls last year = 10 parts x 4 = 40 parts

As 1 part = 1 unit now,
Total = 30 + 40 = 70units/parts


1 unit/part = 210 people ÷ 70 = 3 people

Total students this year
= 36 units x 2
= 72 units
= 72 x 3 people
= 216 people

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AC Lim
Ac Lim's answer
12076 answers (A Helpful Person)
1st
Hope this help
FYI.
Last year Boy=90
Last year Girl=120
U can check the answer