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primary 6 | Maths
| Ratio
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now
F : B : B-F = 3:5:2 = 6u:10u:4u
9 yrs ago
F : B : B-F = 3u:7u:4u
6u-3u = 10u-7u = 3u = 9 yrs
now for brother
10u = 10×9÷3 = 30 (Ans)
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