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simple question just not getting it

Expert replies
by grandh01 » Fri Jul 06, 2012 10:02 am
In May, Xiang sold 15 used cars. For these 15 cars, the range of the selling prices was $15,000 and the lowest selling price was $4500. In June, Xiang sold 10 used cars. For these 10 cars, the range of the selling price was $16,500 and the lowest selling price was $6,100. What was the range of the selling prices of the 25 used cars sold by Xiang in May and June?

1) $15, 600
2) $15,750
3) $16, 820
4) $18, 100
5) $19,200

Thanks in advance
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Source: — Problem Solving |

by eagleeye » Fri Jul 06, 2012 10:16 am
Range for May = Highest - Lowest => Highest Price for May = Lowest + Range = 4500 + 15000 = 19500
Range for June = Highest - Lowest => Highest Price for June = Lowest + Range = 16500 + 6100 = 22600

Overall Range for the 25 cars = Overall Highest - Overall Lowest = 22600 - 4500 = 18100

Hence D

Let me know if this works :)
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