Question

The average of 20 values is 18. If 31
subtracted from each of the values, the
the new average will be.
​

Answer 1

let x be the sum of twenty numbers

average= 18

x/20= 18

x= 360

Now subtracting 31 from the acquired number

we have,

360-31= 329

Thus the new average will be,

329/20= 16.45