If $a:b::c:d$ and $a = 2,\ b = 5,\ c = 6$, then $d$ is

If $a:b::c:d$ and $a = 2,\ b = 5,\ c = 6$, then $d$ is
  1. $15$
  2. $12$
  3. $10$
  4. $30$

Solution

$\dfrac{2}{5} = \dfrac{6}{d} \Rightarrow 2d = 30 \Rightarrow d = 15$.

Asked in: MH-SSC-9

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