Dana and mike own a camping supply store and just put in an order for flashlights and sleeping bags. the number of flashlights ordered was five times the number of sleeping bags. the flashlights cost $12 each and the sleeping bags cost $45 each. if the total cost for the flashlights and sleeping bags was $1785, how many flashlights and how many sleeping bags did dana and mike order?

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the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).