Question 92540
with work problems, the trick is to see what fraction of the job is done by each person


if Simone can build a treehouse in 15 hours, then in 7 hours she builds 7/15 of the treehouse


this means Tyrese builds 8/15 of the tree house in 7 hours ... so 7 is to 8/15 as x is to 15/15 (or 1 whole treehouse)