Mamie saved $161.25. This is 25% of the amount she needs to save. How much money does Mamie need to save?

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Answer 1 · 2016-12-02T17:59:20

$$645$

$25%$ is the same as $1/4$

If The amount that Mamie has saved is $1/4$ of what she needs, then the full amount will be 4 times as much.

$$161.25 xx 4 = $645$

Or you can write a proportion:
"If $161.25 is 25%, how much is 100%?"

$25/100 = 161.25/x$

$x = 161.25 xx 100/25$

$x = $645$