Question

Question 8
The average of five numbers is 18. If four numbers are 22, 20, 14 and 13 then find the fifth number.

Answer 1

Answer:

Let the unknown no. be x.

Average = 18

22 + 20 + 14 + 13 + x ÷ 5 = 18

69 + x = 18 × 5

69 + x = 90

x = 90 - 69

x = 21

Therefore , the fifth no. is 21.

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