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Chapter 4: Q60. (page 181)

BASIC SKILL

Use cross products to solve each proportion.

60. 420=1m

Short Answer

Expert verified

Given proportion is simplified to m=5

Step by step solution

01

- Cross product between two proportions

Let ab and cd be two equal proportions that is ab=cd

Then cross product is defined as multiplication of denominator of one proportion with the numerator of other proportion, that is ad=bc

02

- Substitution

Substitute 4 for a, 20 for b, 1 for c, and m for d into ad=bc gives

4脳m=20脳1

03

- Simplify 4×m=20×1

To simplify this expression multiply both the numbers of right side and then divide it from number on the left as shown below

4m=20m=204m=5

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