[問題]PP的問題

[snood1014]

Stock --- No. of shares
V -------- 68
W -------- 112
X -------- 56
T -------- 94
Z -------- 45

The table shows the number of shares of each of the 5 stocks owned by Mr. Sami
If Mr. Same 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 number of shares of the 5 stocks owned by Mr. Sami?
1) 4
2) 6
3) 9
4) 15
5) 20


答案是D
不太懂這題要問什麼
請大家幫我解惑 謝謝!!

[StanleyHuang]

撒米先生有五檔股票，如表所示。如果撒米先生要賣掉20張X，買進24張Y，要問他這五檔股票的range會增加多少？

[simonyu]

妳的題目是不是有key錯啊？解不太出來說～
buy 24 shares of stock "Y"---是不是應該是"T"?

如果是的話，
原本{68,112,56,94,45}的數列裡，range=max-min=112-45=67
交易之後變成{68,112,36,118,45}，range=118-36=82
所以增加了82-67=15
答案D