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WBCS Preliminary Examination 2017 — General Studies · Question 164 of 200

Q164
ArithmeticAlgebra, Equations & Operations
If $a * b = ab + b - a$, what is the value of $c$ such that $c*(2*5) = 97$?
  1. a.8
  2. b.7
  3. c.3
  4. d.91

Answer: (B) 7

First, $2*5 = (2)(5)+5-2 = 13$. Then $c*13 = (c)(13)+13-c = 12c+13 = 97$, so $12c=84$ and $c=7$.

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If a * b = ab + b - a, what is the value of c such that c*(2*5) = 97? — WBCS Preliminary Examination 2017 Q164 | Prostuti360°