78 is 15 percent of what number?
First you need to make the percent into a decimal and then divide the number by the decimal; so 15% = 0.15.
78 ÷ 0.15 = 520
so...78 is 15% of 520
hope that helps:D
Let x = a number 78 = 15% x 78 = 0.15 78/0.15 = 0.15/0.15 answer=520
