solution to question paper 1 --- IPM STD V

The sum of 3 consecutive even number is 78. What is the middle number?

Answer:

In this type of questions, where they say of consecutive even numbers or odd numbers, please the following step:

First number:  a – 2

Second number: a

Third number: a + 2

So, sum of the numbers = a-2 + a + a + 2 = 3a

Now given 3a = 78

So, a = 26.

So, the middle number is 26.