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Question
primary 6 | Maths
| Percentage
One Answer Below
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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
See 1 Answer
FYI.
Last year Boy=90
Last year Girl=120
U can check the answer