Question

The sum of 2 integers is 15. If one of the integers is 20, then what is the other?

• A. 5
• B. 10
• C. -5
• D. 35

Answer 1

The correct option is C -5

Given one of the numbers is 20 and the sum is 15.
We know that addition means moving on to the right of zero. So, we move 20 steps to the right, and to get 15 we have to move 5 steps towards left from 0.Here, moving left for 5 steps is same as -5.
Hence the other number is -5.