Question

The average of 12 numbers is 9. If
each number is multiplied by 2 and
added to 3, the average of the new
set of numbers is?

Answer 1

let the sum of 12 no. be x

average = sum of no. / total no.

9=x/12

x=108

ATQ

sum = 2×108 + 12 ×3 = 216+36 = 252

average = 252/12 = 21

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