A student was asked to multiply a number by 25

A student was asked to multiply a number by 25. He instead multiplied the number by 52 and got the answer 324 more than the correct answer. The number to be multiplied was

  1. 15
  2. 32
  3. 12
  4. 25

Answer

Let the number to be multiplied be = x

So, we have 52x = 25x + 324

52x - 25x = 324

x = 324 / 27 = 12

The correct option is C.