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17 Dec 2018, 02:30
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Difficulty:
35%
(medium)
Question Stats:
72% (02:16) correct
28%
(02:21)
wrong
based on 390
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What is the range of the set 2/3, 8/11, 5/8, 4/7, 9/13 ?
A. 3/56
B. 2/21
C. 11/91
D. 12/77
E. 55/77
A. 3/56
B. 2/21
C. 11/91
D. 12/77
E. 55/77
17 Dec 2018, 04:36
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Archit3110
Thats a great question as the main point here is to find the largest and smallest value in the least time..
There are various ways..
Here, the first step would be to find some similarity in numerators or denominators.
(I) get them into same numerator or same denominator
There are three numbers with multiple of 2, and 8 is the maximum, so get all in terms of 8..
\(\frac{2}{3}=\frac{2*4}{3*4}; \frac{8}{11}; \frac{4}{7}=\frac{4*2}{2*7}\)...
when numerators are same, bigger the denominator, smaller the number..
So, \(14>12>11..... \frac{8}{11}>\frac{2}{3}=\frac{2*4}{3*4}>\frac{4}{7}=\frac{4*2}{2*7}\)..
Let me check 5/8 with 4/7 and 8/11 by second way..
(II) Get the fractions in form of \(\frac{a+x}{b+x}\)
all three fractions have a difference of 3 in numerator and denominator that is d-n=3..
so let me write all of them in same terms.. \(\frac{4}{7};\frac{4+1}{7+1};\frac{4+4}{7+4}\)....
In these three if the gap is same bigger the number, bigger the fraction so \(\frac{4}{7}<\frac{4+1}{7+1}<\frac{4+4}{7+4}\)
Now you have largest as 8/11 and smallest as 4/7 and we have to compare 9/13...
when you compare 4/7, you can convert it into 4*2/7*2=8/14 ... now 8/14 has a bigger numerator and a smaller denominator than 9/13, so 8/14 is smaller..
(III) Cross-multiply - You can cross-multiply too to find the answer .. 8/11 vs 9/13 .. 8*13 vs 9*11 = 104 vs 99 .. since 104 is bigger, 8/11 is bigger as 104 represents the numerator 8.
so range = \(\frac{8}{11} - \frac{4}{7}=\frac{56-44}{77}=\frac{12}{77}\)
C
General Discussion
17 Dec 2018, 02:33
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Range = 8/11 -4/7 = 12/77
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Posted from my mobile device
