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Question
primary 5 | Maths
| Rate & Ratio
One Answer Below
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Date Posted: 3 years ago
Views: 472
One item/variable is unchanged (number of boys)
Since there are 4 times as many girls now,
Ratio of boys : girls now
= 1 : 4
x3↓
= 3 : 12
Ratio at first = 3 : 2
12 units - 2 units = 10 units
Number of girls increased by 10 units.
So 10 units = 70
1 unit = 70 ÷ 10 = 7
Number of boys
= 3 units
= 3 x 7
= 21
Since there are 4 times as many girls now,
Ratio of boys : girls now
= 1 : 4
x3↓
= 3 : 12
Ratio at first = 3 : 2
12 units - 2 units = 10 units
Number of girls increased by 10 units.
So 10 units = 70
1 unit = 70 ÷ 10 = 7
Number of boys
= 3 units
= 3 x 7
= 21
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