The length and width of a rectangle is in the ratio 3:4. What is the lengh of the rectangle if the width is 40 inches?

30 inches

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40 inches

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7 inches

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70 inches

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Solution

The correct option is A 30 inches
Length and width are in the ratio 3:4
$\frac{3}{4}$ = $\frac{z}{40}$
3 $\times$ 40 = z $\times$ 4
z = 30 (divide by 4 on both sides)
length = 30 inches

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