# What will be the Fourth Number? If

The average of 6 numbers is 30. If the average of first four is 25 and that of last three is 35, the fourth number is

- 25
- 30
- 35
- 40

**Answer: (1) 25**

**Explanation:-**

The average of 6 numbers = 30

The sum of 6 numbers = 30 x 6

= 180

The average of first four numbers = 25

Then, the sum of first four numbers = 25 x 4 = 100

The average of last three numbers = 35

Then, the sum of last three numbers = 35 x 3 = 105

Fourth number is = (100 + 105) – 180

= 205 – 180

= 25

Hence, the fourth number is 25.