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Question

At first, Lina had $24 less than Kelly. After Kelly spent $45 and Lina spent $33, Kelly had three times as much money as Lina. How much money did Lina have at first?

 

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Answer

Kelly     [u][u][u][ — 21—–][—–24—–]

                               <—-spent 45—–>

Lina      [u][——–33——–]

                    <-spent 33–>

3u +  21 = u +   33

2u = 33-21 = 12

u = 6

At first, Lina has u + 33 = 6 +33 = $39

 

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