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January 30, 2015

January 30, 2015

Posted by **kelsey** on Monday, December 12, 2011 at 10:35am.

- math -
**Reiny**, Monday, December 12, 2011 at 10:54amRyan's rate per bag = 1/12

sister's rate ber bag = 1/24

combined rate = 1/12 + 1/24 = 3/24

time per bag working together = 1/(3/24) = 24/3 = 8 minutes

so it would take them 80 minutes to do 10 bags

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