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Chapter 1: Q18. (page 21)

Use the percent proportion to find the following number.

5% of what number is 3.5?

Short Answer

Expert verified

5% of 70 is 3.5.

Step by step solution

01

Step 1. Definition of percent.

Percent of a number is defined as the ratio of number and 100.

02

Step 2. Formula Used.

The ratio of part x of some number y is equal to the percent is written as.

xy=p100

03

Step 3. Find the percent proportion.

x = 3.5, percent = 5 and y =?

xy鈥�=p100鈥�鈥�鈥�3.5y=5100鈥�crossmultiply3.5脳100=5y350=5y鈥�鈥�dividebothsideby53505=5y570=yy=70

Hence, 5 percent of 70 is 3.5.

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