Question

A number gives a remainder of 5 when divided by 10. Another number gives a remainder of 4 when divided by 10. The sum of these two numbers is multiplied by 3 to give the third number. What is the remainder when this third number is divided by 10?​

Answer 1

The remainder is 7.

Explanation:

Let's pick 15 and 14. The sum of these two numbers is 29. Multiplying 29 by 3, we have 87. 87 divided by 10 is 8 with a remainder of 7.