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Chapter 1: Q14. (page 21)

Use the percent proportion to find the following number.

What is 25% of 18?

Short Answer

Expert verified

25% of 18 is 4.5.

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.

Percent = 25, y = 18 and x = ?

xy鈥�=p100x18=25100鈥�crossmultiplyx脳100=18脳25100x=450鈥�鈥�dividebothsideby50100x50=450502x=9x=92x=4.5

Hence, 25% of 18 is 4.5.

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