Question

16 is what percent of 72?

Answer 1

percent formula : is / of = % / 100

16 is what percent of 72...

is = 16
of = 72
% = x

sub into the formula
16/72 = x / 100
cross multiply because this is a proportion
(72)(x) = (100)(16)
72x = 1600
x = 1600/72
x = 22.2 % <===

Answer 2

16/72 is equal to 2/9
So the answer is
    =22.222222