3 Assignments

Algebra Level 3

Jimmy needs 15 days to complete assignment A,B or C. Cody needs 12 days to complete assignment A,B or C. Harold needs 10 days to complete assignment A,B or C. How many days will it take if they do assignments A,B and C together?


The answer is 12.

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Jia Quan Ng by Jia Quan Ng , 21, Malaysia

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2 solutions

Jia Quan Ng
Oct 2, 2014

They need to do 3 assignments in total. For assignment A, together they can complete 1/15 + 1/12 + 1/10=15/60=1/4 in a day. So they need 4 days to complete assignment A. Same goes to B and C. Therefore, 4x3=12

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within 1 day they together can complete 1/15+1/12+1/10 means 1/4 of any 1 assignment.so they can complete 1 assignment in 4 days!so 3 assignments in 12 days.

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