A homeowner has a new oil furnace which has an efficiency of 60%. For every 100 barrels of oil needed to heat his house, how much (in barrels of oil) goes up the chimney as waste heat?
A) 20
B) 60
C) 40
D) 80
E) 10

Question

Quizplus · Accepted Answer

If the furnace has an efficiency of 60%, it means that 40% of the oil is going up the chimney as waste heat. Therefore, for every 100 barrels of oil, 40 barrels will be wasted.

A Homeowner Has a New Oil Furnace Which Has an Efficiency