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For how many weeks will Steven need to deposit money into his savings account before he can pay back his sister and buy the bike?

Steven wants to buy a $565 bicycle. Steven has no money saved,but will be able to deposit $30 into a savings account when he receives his paycheck each Friday. However, before Steven can buy the bike,he must give his sister $65 thathe owes her. For how many weeks will Steven need to deposit money into his savings account before he can pay back his sister and buy the bike?

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Mark M. | Mathematics Teacher - NCLB Highly QualifiedMathematics Teacher - NCLB Highly Qualif...
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If I were his sister I would not wait. I would demand the first and second $30 and part of the fourth to repay the debt.
That is three weeks with $25 for the savings account.
He now must save and additional $540. 
How many weeks at $30 a week?