Read this proportion- and complete it- 82-20x

82=20x 4=20x ⇒ 4x=20 ⇒ x=204=5 ∴ x=5 ...

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Standard VII

Mathematics

Changing Scale (Including Flags)

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Question

Read this proportion, and complete it:
$\frac{8}{2} = \frac{20}{x}$

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Solution

$\frac{8}{2} = \frac{20}{x}$

$4 = \frac{20}{x}$

$\Rightarrow 4 x = 20$

$\Rightarrow x = \frac{20}{4} = 5$

$∴ x = 5$

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Read this proportion, and complete it:82=20x

82=20x4=20x⇒4x=20⇒x=204=5∴x=5

Read this proportion, and complete it:
$\frac{8}{2} = \frac{20}{x}$

$\frac{8}{2} = \frac{20}{x}$

$4 = \frac{20}{x}$

$\Rightarrow 4 x = 20$

$\Rightarrow x = \frac{20}{4} = 5$

$∴ x = 5$