一道数学题，大虾进来瞅瞅：）

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

Answer: 15

Stock     Number of Shares

   V          68

   W         112

    X           56

    Y          94

    Z         45

谁能告诉我这个15是怎么出来的呀？题目我也有些看不懂。

112-45=67

56-20=36；（94+24）-（56-20）=118

118-36=82

82-67=15

So: 15

the range ==>求RANGE的一道题,

建议楼主看看数学的基本英文单词

112-45=67

56-20=36；94+24=118

118-36=82

82-67=15

So: 15

i c!

谢谢大家的指教