Question

Nina deposited $20.59 in her checking account. Later that week, she wrote a checkfor one-third the amount in the account, and then another check for $9.74. If shehad $108.60 left in her account, how much did she have to begin with.

Answer 1

`112.59`

1) Reading carefully, we can do it step by step.

2) She had deposited $20.59 and wrote a check, since she wrote a check we can understand that as a debit so we can write out the following:

`\begin{gathered} 20.59-(20.59)/(3)= \\ 20.59-6.86 \\ 13.7 \end{gathered}`

Note that we rounded off to the nearest hundredth.

2.2) So now, she wrote another check, i.e. -$9.74

`\begin{gathered} \$13.7-\$9.74 \\ \$4 \\ 108.60 \\ 108.60+\mleft(20.59-6.86-9.74\mright)=112.59 \end{gathered}`