SOLUTION: 18 persons can wash 50 cars in 4 hours. How long will it take 22 persons wash 48 cars ? Thanks for helping me *smile face*

SOLUTION: 18 persons can wash 50 cars in 4 hours. How long will it take 22 persons wash 48 cars ? Thanks for helping me smile face

Question 961624: 18 persons can wash 50 cars in 4 hours. How long will it take 22 persons wash 48 cars ?
Thanks for helping me *smile face*
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
This is uniform work-rates type of problem.

Let r be rate of washing cars for 1 person in unit of car per hour.

RT=J rate time job, and "job" means whatever amount of CARS.

.
Note this system uses two unknown variables and is of two equations. One of the equations has just the variable, r, and that is the equation you use first; and then substitute this into the other equation and finish solving for t.
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