What is 15% of 72?
Our first proportion is the percentage. 15% means 15 out of 100.
We want to find 15% of 72, so 72 is a denominator.
Solve for x. Cross multiply.
Divide by the coefficient of x.
So 15% of 72 is 10.8
80% of 40 is what number?
Our first proportion is the percentage. 80% means 80 out of 100.
We need to find 80% of 40, so 40 is a denominator.
So 80% of 40 is 32
30% of what number is 15?
Our first proportion is the percentage. 30% means 30 out of 100.
We need to find 30% of a number, x, so x is a denominator.
So 30% of 50 is 15
What percent of 60 is 20?
Our first proportion is the percentage. We do not know our %, so it is x.
20 is part of 60, so that is a ratio of 20/60.
Write 15% as a decimal.
Translate the equation. What (x) is (=) 15% of (multiply) 72?
Solve the equation. It’s 10.8
Write 80% as a decimal.
Translate the equation.80% of (multiply) 40 is (=) what number (x)?
Solve the equation. It’s 32.
Write 30% as a decimal.
Translate the equation.30% of (multiply) what number (x) is (=)15?
Solve the equation; divide by the coefficient.
Here our percentage is unknown, so it is x.
Translate the equation.What percent (x) of (multiply) 60 is (=) 20?
Reduce the fraction
Finally, translate this back into a percent.
Make it rain.
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