If $a:b = 3:4$ and $b = 20$, then $a$ equals

If $a:b = 3:4$ and $b = 20$, then $a$ equals
  1. $15$
  2. $12$
  3. $20$
  4. $24$

Solution

$\dfrac{a}{20} = \dfrac{3}{4} \Rightarrow a = 15$.

Asked in: MH-SSC-9

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