Jasper Eng's answer to Sid's Primary 5 Maths Rate & Ratio Singapore question.
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Children to adult = 2:3
Boy: Girl = 5:3
Total Children ratio = 5+3
= 8
Children to adult = 2:3
= 8:12 (multiply by 4)
8 + 12 = 20 units
20 units -> 100 people
1 unit -> 100 / 5
= 20 people
Boy is 5 unit:
5 unit -> 5 x 5
= 25 boys //
Boy: Girl = 5:3
Total Children ratio = 5+3
= 8
Children to adult = 2:3
= 8:12 (multiply by 4)
8 + 12 = 20 units
20 units -> 100 people
1 unit -> 100 / 5
= 20 people
Boy is 5 unit:
5 unit -> 5 x 5
= 25 boys //
Date Posted:
3 years ago
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