Solve Proportions and their Applications: example 6.51

Translate and solve using proportions: What number is $45%$ of $80 ?$

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Your turn

The book's Try It right after this example: same idea, new numbers. Only the answer is given.

Translate and solve using proportions: What number is $65%$ of $40 ?$

How did it go?

Identify the parts of the percent proportion.
Restate as a proportion.
Set up the proportion. Let $n =$ number.
Find the cross products and set them equal.
Simplify.
Divide both sides by 100.
Simplify.
Check if the answer is reasonable.
Yes. 45 is a little less than half of 100 and 36 is a little less than half 80.
Write a complete sentence that answers the question.	36 is 45% of 80.

Identify the parts of the percent proportion.
Restate as a proportion.
Set up the proportion. Let $n =$ number.
Find the cross products and set them equal.
Simplify.
Divide both sides by 100.
Simplify.
Check if the answer is reasonable.
Yes. 45 is a little less than half of 100 and 36 is a little less than half 80.
Write a complete sentence that answers the question.	36 is 45% of 80.