SOLUTION: On a house plan on which 2 inches represents 5 feet, the length of a room measures 7 1/2 inches. The actual length of the room is. I know how to set the problem up but don't know t

Algebra ->  Proportions -> SOLUTION: On a house plan on which 2 inches represents 5 feet, the length of a room measures 7 1/2 inches. The actual length of the room is. I know how to set the problem up but don't know t      Log On


   

Question 325680: On a house plan on which 2 inches represents 5 feet, the length of a room measures 7 1/2 inches. The actual length of the room is. I know how to set the problem up but don't know the next step. 2 inches/7 1/2 inches = 5/x I know to cross multiply what next Please help.
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
1 in = 2.5 ft
2.5*7.5=18.75 ft
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2/7.5=5/x
2*x=5*7.5
2x=37.5
x=18.75
multiply the extremes
multiply the means