Master and apprentice

Master painted the roof in 3 hours and apprentice for 4 hours. How many of roof they painted in hour and how many in three quarters of an hour?

Result

x = 7/12 Wrong answer
y = 7/16 Wrong answer

Solution:

x=1/3+1/4=7/12x = 1/3 + 1/4 = 7/12
y=3/4x=3/4⋅7/12=7/16 y= 3/4 x = 3/4 \cdot 7/12 = 7/16

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