Difference between revisions of "2019 AMC 12B Problems/Problem 5"

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Exact change to buy 12 red candy, 14 green candy, 15 blue candy, or n purple candy. Purple candy cost 20 cents, what is the minimum number of n?
We simply need to find a value of 20*n that divides 12, 14, and 15. 20*18 divides 12 and 15, but not 14. 20*21 successfully divides 12, 14 and 15, meaning that we have exact change (in this case, 420 cents) to buy each type of candy, so the minimum value of <math>\boxed{n = 21}</math>.
==See Also==
{{AMC12 box|year=2019|ab=B|num-b=4|num-a=6}}
{{MAA Notice}}

Latest revision as of 14:39, 14 February 2019

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