ExplanationThe question asks by how many pies per hour the baker’s rate of pie-making increased, so determine his rate for the first 5 hours and his rate in the last 3 hours. The difference is the ultimate answer:
Rate for last 3 hours – Rate for first 5 hours = Increase
The rate for the first 5 hours was 60 pies ÷ 5 hours = 12 pies per hour.
In the last 3 hours, the baker made 150 – 60 = 90 pies. The rate in the last 3 hours of the workday was thus 90 pies ÷ 3 hours = 30 pies per hour.
Now find the difference between the two rates of work:
30 pies per hour – 12 pies per hour = 18 pies per hour
_________________
SandyIf you found this post useful, please let me know by pressing the Kudos ButtonTry our free Online GRE Test