sstrike's answer to Azfer's Primary 6 Maths Ratio Singapore question.

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sstrike
Sstrike's answer
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sstrike
Sstrike
3 years ago
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LCM → 3, 4 → 12

At first
B : G = 5 : 3 = 20u : 12u

In the end
B : G = 5 : 4 = 15u : 12u

20u-15u = 5u = 20

u = 20÷5 = 4

12u = 12×4 = 48 (Ans)