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Algebra as Patterns

If 10 burgers...

Question

If 10 burgers are sold for 4 dollars, how many dollars are needed to buy 20 burgers?

A

8

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B

4

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C

40

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D

14

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Solution

The correct option is A 8
Price of 10 burgers = 4 dollars
To buy 20 burgers,
$\frac{10}{4}$ = $\frac{20}{z}$
z $\times$ 10 = 4 $\times$ 20
z = 8 dollars (divide by 10 on both sides)

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