A roast was cooked at 325° F in the oven for 4 hours. The internal temperature rose from 32° F to 145° F. What was the average rise in temperature per hour?
A. 20.2° F/hr
B. 28.25° F/hr
C. 32.03° F/hr
D. 7° F/hr
E. 37.29° F/hr
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ravikashyap1196
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nipunranjan
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The rise in temperature= 145-32=113 Degree F
Time = 4 Hour
Average rise in temperature = 113/4 = 28.25 (Option B)
Time = 4 Hour
Average rise in temperature = 113/4 = 28.25 (Option B)
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Jim@StratusPrep
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You really don't have to do the math on this problem. The answer can only end in .00, .25, .50 or .75. Ballparking your answer will show you that D is not the answer so it must be B.
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Uva@90
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Jim,Jim@StratusPrep wrote:You really don't have to do the math on this problem. The answer can only end in .00, .25, .50 or .75. Ballparking your answer will show you that D is not the answer so it must be B.
How do u conclude that answer can only end in .00,.25,.50,.75 ?
Could u please clarify it so that it will helpful in my future GMAT problems.
Thanks in advance.
Regards,
Uva.
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Hi Uva.
Since the prompt mentions "4 hours", you have to divide by 4. Dividing any integer by 4 means that there's only a handful of possible outcomes for what follows the decimal. For example:
4/4 = 1.0
5/4 = 1.25
6/4 = 1.5
7/4 = 1.75
and the pattern repeats
8/4 = 2.0
9/4 = 2.25
etc.
GMAT assassins aren't born, they're made,
Rich
Since the prompt mentions "4 hours", you have to divide by 4. Dividing any integer by 4 means that there's only a handful of possible outcomes for what follows the decimal. For example:
4/4 = 1.0
5/4 = 1.25
6/4 = 1.5
7/4 = 1.75
and the pattern repeats
8/4 = 2.0
9/4 = 2.25
etc.
GMAT assassins aren't born, they're made,
Rich
