Question

the number of calculators mrs. hopkins can buy for the classroom varies inversely as the cost of each calculator. she can buy 24 calculators that cost $60 each. how many calculators can she buy if they cost $80 each?
Let x = number of calculators she can buy,
80x=60*24
x=60*24/80 = 18
Mrs Hopkins can buy 18 calculators at $80 each.

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