We want to find what number's 30% is 15 by using a model. We can split the model into intervals of 10%. There are 10 such intervals in 100%. Since 30=10* 3, we can represent 30% by three such intervals. Let's find what number's 30% is 15!
We found that 15 is 30 % of 50.
Checking Our Answer
We can check our answer by solving the percent proportion. The percent proportion is a proportion that sets the ratio of a part of a whole equal to the ratio of a percent out of 100. We can represent a is p percent of wwith the given proportion.
part/whole=percent/100 ⇔ a/w=p/100
We can find what number's 30% is 15 by thinking about 30 as the percent and 15 as a part of the whole. Let's substitute a= 15 and p= 30 into the formula and solve for w using the Properties of Equality.
