Question

15% of what number is 129

Answer 1

is/of = %/100
fill in the terms you do know
129/of = 15/100
860 = of
15% of 860 is 129

Answer 2

15% of 860 is 129

Convert your percentage into a decimal:

`(15)/(100) = 0.15`

Divide 129 by your decimal:

`129 / 0.15 = 860`