Question

Find x if the average of 20,20,19,13 and x is 16.

Answer 1

average = summation of numbers / total items
so average is given 16
so,
16= (20+20+19+13+x)/ 5
=> 16= (72+x) / 5
multiply both sides by 5,
16 x 5=\[\frac{ (72+x)5 }{ 5 }\]
90 = 72+x
subtract 72 from both sides,
90-72=72-72+x
18=x
so
x=18

Answer 2

thank you!!!