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Free GMAT Sample Paper

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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by ravikashyap1196 » Wed Aug 07, 2013 9:01 pm
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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by nipunranjan » Sun Aug 11, 2013 8:19 am
The rise in temperature= 145-32=113 Degree F

Time = 4 Hour

Average rise in temperature = 113/4 = 28.25 (Option B)
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by Jim@StratusPrep » Tue Aug 20, 2013 6:55 am
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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by Uva@90 » Sat Aug 24, 2013 9:16 pm
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.
Jim,
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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by [email protected] » Sun Aug 25, 2013 12:30 am
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.

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