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posted by chelsea Friday, February 3, 2012 at 6:16pm.
if jack can mow his lawn in 4 hours and sue can mow the same lawn in 7 hrs how much time if they both mowed the lawn together???
1/n = 1/4 + 1/7 = 11/28 n = 28/11 = 2 6/11 hours
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