Master and apprentice

Master painted the roof in 3 hours and apprenticed for 4 hours. How many roofs do they paint an hour, and how many in three-quarters of an hour?

Result

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

Step-by-step explanation:

x=1/3+1/4=7/12
y=3/4x=3/47/12=7/16



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