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Source: Magoosh
When Mary paints a house, it takes her 4 hours. When Lisa joins Mary, and they work together, it takes them only 3 hours to paint a house of the same size. How long would it take for Lisa to paint a house of the same size by herself?
A. 5 hr
B. 6 hr
C. 7 hr
D. 12 hr
E. 20 hr
The OA is D
When Mary paints a house, it takes her 4 hours. When Lisa joins Mary, and they work together, it takes them only 3 hours to paint a house of the same size. How long would it take for Lisa to paint a house of the same size by herself?
A. 5 hr
B. 6 hr
C. 7 hr
D. 12 hr
E. 20 hr
The OA is D
