模考数学题没弄懂一道，求助大神！

ItalyPirlo

求助帖：在mba官网模拟测试一里面，做了没看懂的一道题，求高手大神指点！

Stock        Number of share
V            68
W            112
X             56
Y            94
Z            45


The table shows the number of shares of each of the 5 stocks owned by Mr. Sami. If Mr. Sami was to sell 20 shares of Stock X and buy 24 shares of Stock Y, what would be the increase in the range of the numbers of shares of the 5 stocks owned by Mr. Sami?


1) 4
2) 6
3) 9
4) 25
5) 20

candybecky

这道题解析答案是多少啊？
我理解的是求 极差的变化
算出来时15.。。。

bradfordchens

Stock Number of shares Before and After transaction
V - 68 - 68
W - 112 - 112
X - 56 - 36
Y - 94 - 118
Z - 45 - 45
Previous range - 67 (112-45)
Range after transaction - 82 (118-36)
Increase = 82 - 67 = 15 D

ItalyPirlo

答案D没错。原来我没弄懂range的意思，准备时间太短了惭愧啊。多谢了！