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Originally posted by Bunuel on 02 Dec 2024, 07:53.
Last edited by Bunuel on 23 Sep 2026, 05:09, edited 1 time in total.
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Dropdown 1: one-third
Dropdown 2: 1.8
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The graph shows the costs of ethanol, conventional gasoline (NY Harbor), and corn from January 2008 through January 2017. Ethanol and gasoline costs, in dollars per gallon, are shown on the left vertical axis, and corn costs, in dollars per bushel, are shown on the right vertical axis.
Select from each drop-down menu the option that creates the most accurate statement based on the information provided.
When the cost of corn was at its highest, the cost per gallon of ethanol was approximately of the cost per bushel of corn.
The range of costs for corn was approximately times the range of costs for gasoline.
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Originally posted by Bunuel on 04 Jan 2025, 02:00.
Last edited by Bunuel on 23 Sep 2026, 05:10, edited 1 time in total.
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Official Solution:
Bunuel
The graph shows the costs of ethanol, conventional gasoline (NY Harbor), and corn from January 2008 through January 2017. Ethanol and gasoline costs, in dollars per gallon, are shown on the left vertical axis, and corn costs, in dollars per bushel, are shown on the right vertical axis.
Select from each drop-down menu the option that creates the most accurate statement based on the information provided.
When the cost of corn was at its highest, the cost per gallon of ethanol was approximately of the cost per bushel of corn.
The range of costs for corn was approximately times the range of costs for gasoline.
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Drop-down 1:
The cost of corn, represented by the red line, was at its highest around the middle of 2011, reaching approximately $7.50 per bushel on the right vertical axis. At the same time, the cost of ethanol, represented by the black line, was approximately $2.50 per gallon on the left vertical axis.
Since \(\frac{2.5}{7.5}=\frac{1}{3}\), the cost per gallon of ethanol was approximately one-third of the cost per bushel of corn.
Drop-down 2:
The highest cost of corn was approximately $7.50 per bushel, while the lowest was approximately $3.00 per bushel, giving a range of approximately $4.50.
The highest cost of gasoline was approximately $3.10 per gallon, while the lowest was approximately $0.60 per gallon, giving a range of approximately $2.50.
Therefore, the range of costs for corn was approximately \(\frac{4.5}{2.5}=1.8\) times the range of costs for gasoline.
Originally posted by sxmrenn on 22 Sep 2026, 19:57.
Last edited by Bunuel on 23 Sep 2026, 05:11, edited 1 time in total.
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The # labels on the y axis for Cost per Bushel (corn) are very skewed, so I miscalculated the numbers. Are they supposed to be in that exact spot? Or are they also skewed? If they are supposed to be like that, in the GMAT when I see a problem where the numbers look off, should I go based off of the gap in the numbers, or the horizontal lines on the graph?
The # labels on the y axis for Cost per Bushel (corn) are very skewed, so I miscalculated the numbers. Are they supposed to be in that exact spot? Or are they also skewed? If they are supposed to be like that, in the GMAT when I see a problem where the numbers look off, should I go based off of the gap in the numbers, or the horizontal lines on the graph?
Show more
Yes, the right-side labels in the original graph were poorly aligned, which made the scale unnecessarily confusing. I have revised the graph so that each corn value is clearly aligned with its corresponding tick position.
On the GMAT, always read a value using the axis assigned to that series. Here, corn must be read from the right vertical axis, while ethanol and gasoline must be read from the left vertical axis. Do not assume that a horizontal gridline represents the same numerical value on both axes.
In general, use the tick marks and their labels to determine the scale.