Question

Sana has 100 dollars more than Reeha. After Sana spends 20 dollars on groceries she has 5 times as much money as Reeha has. How much money does Reeha has?

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Answer 1

M = A + 100

M-20 = 5A

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Rearrange:

M - A = 100

M -5A = 20

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Subtract 2nd from 1st to get:

4A = 80

A = 80

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Substitute to solve for M:

M = 80+100 = 180

Explanation: