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Range of numbers - E

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by tanyajoseph » Sat Sep 01, 2007 10:32 am
The number of books read by 7 students last yr were 10,5,p,q,r,29 and 20. What was the range of the numbers of books read by the 7 students last year?

1) 5<p<q
2) p<r<15
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Source: — Data Sufficiency |
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by agps » Sat Sep 01, 2007 11:13 am
you need to know the smallest and the biggest number to know the range.

1) tells you that p and q are less than 5, but nothing on r, so r could be the smallest, but you wouldn't know, insufficient.

2) tells you that p and r are less than 15, and that r is more than p, but nothing on q, so q could be the biggest. insufficient

using both you know that the smallest is 5, but you don't know if the biggest is 29 or q, so answer is E.
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