SSC Government Jobs Exams Numerical Ability Ratio and Proportion

If a:b=1:2 and b:c=3:4 find a:b:c?

A.) 3:8:6 B.) 3:12:6
C.) 3:6:8 D.) 1:2:4

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SSC Other Question

If a:b=1:2,b:c=3:4 and c:d=2:3 find a:b:c:d?

A.) 3:6:8:24 B.) 6:12:16:24
C.) 6:18:24:16 D.) 3:6:2:3
Find the mean proportional between 49 & 81?

A.) 16 B.) 10
C.) 63 D.) 12