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23 December, 13:26

Virginia's parents gave her money to put in her cafeteria account at the beginning of the school year. the function f (s) = 60 - 2.5s describes the amount remaining in her account after she had purchased lunch for s school days. how many days had she eaten in the lunchroom when her account balance was $27.50?

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  1. 23 December, 14:05
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    60 - 2.50s = 27.50 so s = 60-27.50/2.50 = 32.50/2.50 = 13 so Virginia ate lunch for 13 days @2.50 per day.

    check 2.50 x 13 = 32.50 and subtract from 60 you will have 27.50 left
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