Question

the average of the following 5 numbers is 8. find the missing number in 7 5? 3 12 .
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Answer 1

average = 7+5+3+12 +x/5

8. = 27+x/5

8*5 = 27+x

40- 27 = x

13 = x

Answer 2

$\large{\boxed{\boxed{\bf{13}}}}$

Let the missing number be 'a'

Average = $\frac{Sum\:of\:all\:the\:values}{Number\:of\:the\:values\:given}$

=> $\frac{7+5+a+3+12}{5}$ = 8

=> $\frac{27+a}{5}$ = 8

=> a+27 = 40

=> a = 40-27

=> a = 13

Hope it helps you out!!!

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