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Updated on: 08 Dec 2023, 11:35
Originally posted by amitarya on 07 Dec 2023, 08:11.
Last edited by Sajjad1994 on 08 Dec 2023, 11:35, edited 2 times in total.
Last edited by Sajjad1994 on 08 Dec 2023, 11:35, edited 2 times in total.
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Natural gas cost per cubic foot: 0.0070
Propane cost per cubic foot: 0.0175
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
49% (03:04) correct
51%
(03:13)
wrong
based on 1113
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When fully burned, natural gas produces approximately 1,000 BTU of heat per cubic foot of fuel, and propane produces about 2,500 BTU of heat per cubic foot of fuel. For a furnace in which either natural gas or propane may be burned as fuel, the efficiency of a given fuel is the usable heat energy produced when the fuel is burned in the furnace, expressed as a percentage of the total heat energy produced when the fuel is burned.
Kaiser will purchase a furnace whose efficiency with respect to either natural gas burned alone or propane burned alone is 90%. In the table select for natural gas cost per cubic foot and for propane cost per cubic foot the values that are jointly consistent with the information given for which the fuel cost per BTU of usable heat energy produced by this furnace would be approximately the same for each fuel burned alone. Make only two selections, one in each column.
Kaiser will purchase a furnace whose efficiency with respect to either natural gas burned alone or propane burned alone is 90%. In the table select for natural gas cost per cubic foot and for propane cost per cubic foot the values that are jointly consistent with the information given for which the fuel cost per BTU of usable heat energy produced by this furnace would be approximately the same for each fuel burned alone. Make only two selections, one in each column.
| Natural gas cost per cubic foot | Propane cost per cubic foot | |
| 0.0035 | ||
| 0.0070 | ||
| 0.0110 | ||
| 0.0175 | ||
| 0.0350 |
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Official Answer
Natural gas cost per cubic foot: 0.0070
Propane cost per cubic foot: 0.0175
GMATCoachBen
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Updated on: 03 Jan 2024, 22:59
Originally posted by GMATCoachBen on 07 Dec 2023, 16:06.
Last edited by GMATCoachBen on 03 Jan 2024, 22:59, edited 2 times in total.
Last edited by GMATCoachBen on 03 Jan 2024, 22:59, edited 2 times in total.
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amitarya
amitarya I made a video solution for you here:
The key is that our calculation is much less complicated than it might appear at first — the efficiency is the same for both natural gas and propane, so we don't need to take that into account. The only numbers we need are in the 1st sentence.
Therefore, since the cost per BTU must be the same for both, the costs must be in the same ratio as the BTU numbers in the 1st sentence.
So, using the answer choices, we guess and check to find numbers that are in a 1000:2500 (1 : 2.5) ratio:
70*2.5 = 175, so our answers are B and D.
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27 May 2024, 01:08
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Here is a detailed video solution for this interesting question.
See how this question can be solved in the test environment using "Owning the Dataset" approach.
Let us know if you have any questions.
See how this question can be solved in the test environment using "Owning the Dataset" approach.
Let us know if you have any questions.
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