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Dropdown 1: 140 minutes
Dropdown 2: twice as much as
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Difficulty:
95%
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Question Stats:
59% (02:59) correct
41%
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The chart shows the water level in a reservoir over time. The vertical axis represents the water level, in meters, relative to the bottom of the reservoir. The horizontal axis represents the time, in minutes, since monitoring began.
The water level generally decreases as water is used for irrigation, but occasional rainfall causes the level to rise temporarily.
Select the option from each drop-down menu that creates the statement that most accurately reflects the information provided.
If the average rate of water level decrease monitored over the seven hours continues, the water level would reach zero after minutes.
The largest decrease in water level during any 30-minute interval shown on the graph was the largest increase during any 30-minute interval.
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Official Answer
Dropdown 1: 140 minutes
Dropdown 2: twice as much as
Bunuel
Drop-down 1:
Over 420 minutes, the water level dropped from 120 meters to 30 meters, a total decrease of 90 meters. At the same rate, the remaining 30 meters, which is one-third of 90, would take one-third of the time, so 420/3 = 140 minutes.
Drop-down 2:
From the graph, the steepest 30-minute decrease occurred between 120 and 150 minutes, when the level fell from 105 meters to 75 meters (a 30-meter drop). The steepest 30-minute increase occurred between 300 and 330 minutes, when the level rose from 75 meters to 90 meters (a 15-meter rise). The largest decrease (30 meters) is exactly twice as much as the largest increase (15 meters).
I29-164
General Discussion
19 Sep 2025, 12:24
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Quote:
First, lets calculate the average rate of water decrease over the seven hours (420min). rate = work / time, in this case, rate=(120-30)/420=3/14
Than, lets calculate how many time we need to bring the level from 30 to 0 with this rate.
If rate = work/time, time=work/rate, so t=30/(3/14)= 140minutes
Quote:
The largest decrease is from the 360 to 390 minutes with arround 33m decrese.
The largest increase is from the 300 to 330 minutes with arround 15m incrase.
Hence, the largest decrease is twice as much as the largest increase
