Question

. The average of 4 numbers is 7. If the sum of first
three numbers is 20, find the fourth number.​

Answer 1

Answer:

8

Step-by-step explanation:

sum of all numbers=7 x 4= 28

sum of 3 numbers=20

fourth number=28 - 20=8

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Answer 2

Answer:

let the fourth number be x

A/q

Average - Sum of all number / total number

7= 20 + x ÷ 4

28= 20 + x

28-20 = x

8 = x

Hence,fourth number be x = 8