math
posted by sarah .
pencils come in packs of 20 for 2.79 if 18 8th graders and 19 7th graders need 4 pencils how much would it cost?

total students: 18+19 = 37
packs needed for 37 pencils: 37/20 or two packs
cost: 2*2.79 = 5.58
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