quaktar0004 wrote:Can someone please help me with this problem? There has to be a faster method than the explanation given.
31/125 =
a. 0.248
b. 0.252
c. 0.284
d. 0.312
e. 0.320
Another approach:
Since 30/120 = 1/4, we know that the correct answer must be around .25. Eliminate C, D and E.
Now compare 31/125 to 1/4 to see which is larger. To compare fractions, we multiply the denominator in each fraction by the numerator in the other. The numerator that yields the bigger product will belong to the bigger fraction:
4*31 = 124.
125*1 = 125.
Since the numerator of 1/4 yields the bigger product, 1/4 is bigger than 31/125. Thus, the correct answer must be less than 1/4 = .25.
The correct answer is
A.
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