To solve for this, we need to set up fractional proportions.
We have x% out of 100%, x being what we're looking for and 100 being the total maximum percent.
We have 15 out of 20, being one of our fractions.
Our fractions are:
x/100 = 15/20.
To solve for this, we need to cross multiply the denominator of one fraction by the numerator of the other fraction.
Multiply x and 20, and then 100 and 15.
You should end up with:
20x = 1500.
Divide both sides by 20 to solve for x.
20x/20 = x.
1500/20 = 75.
x = 75.
Your final and absolute answer is :
15 is 75% of 20.
I hope this helps!