Steven wants to buy a $500 bicycle. Steven has no money saved, but will be able to deposit $45 into a savings account when he receives his paycheck Friday. However, before Steven can buy the bike, he must give his sister $85 that he owes her. For how many weeks will Steven need to deposit money into his saving account before he can pay back his sister and buy the bike?
45w = 500 + 85 45w = 585 w = 585/45 w = 13 <=== 13 weeks