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The oil burner in a certain house is used to heat the house and to heat the hot water. During the seven cold months when the house is heated, an average of 200 gallons of oil a month is used. In the remaining 5 months, when the house is not heated, a total of 200 gallons of oil is used. What percentage of the year's oil supply is required to heat water during these five months?

a) 1/8 %

b) 7 %

c) 12 1/2 %

d) 14 %

 Jul 22, 2020
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During 7 cold months, the house uses =7 x 200 = 1,400 gallons of oils

1400 + 200 gallons used in the remaining 5 months = 1,600 gallons in total for 1 year.

 

200 / 1,600 = 12 1/2 % of oil is used to heat the water.

 Jul 22, 2020

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