Question

The average of 3 numbers is 7 and average of First two numbers is 4. What is the third number?​

Answer 1

Answer:

Step-by-step explanation:

The average of three numbers is 7 and that is of first two numbers is 4, then what is the third number?

[A]15

[B]13

[C]7

[D]4

13

The sum of three numbers is 7 \times 3 = 21,

and the sum of first two numbers is 2 \times 4 = 8

Then the third number is 21 – 8 = 13.

Hence option [B] is the right answer.

i hope you understood