## anonymous one year ago Find x if the average of 20,20,19,13 and x is 16.

1. anonymous

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

2. anonymous

thank you!!!