Question

Find the missing number 5, ?, 12, 12, when average(mean) is 10.

Answer 1

Answer:

your answer is 11

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Answer 2

Answer:

Sum of numbers

Average = ---------------------------------------

Total number of numbers

= 5 + x + 12 + 12 / 4 = 10

5 + x + 24 / 4 = 10

x + 29 / 4 = 10

(Transversing of 4 to RHS)

x + 29 = 10 × 4

x + 29 = 40

(Transversing of 29 to RHS)

x = 40 - 29

x = 11

Checking

5 + 11 + 12 + 12 / 4

= 16 + 12 + 12 / 4

= 28 + 12 / 4

= 40 / 4

= 10

So, the answer is correct