SSC Government Jobs Exams Numerical Ability Number System

A student was asked to divide a number by 6 and 12 the quotient. He, however, first added 12 to the number and then divided it by 6, getting 112 as the answer. The correct answer should have been

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SSC Other Question

When "n" is divided by 5 the remainder is 2. What is the remainder when n^2 is divide by 5? Four runners started running simultaneously from a point on a circular track. They look 200 sec, 300 sec, 360 sec and 450 sec to complete one round. After how much time do they meet at the starting point for the first time?