Q33:
Of the families in City X in 1994, 40 percent owned a personal computer. The number of families in City X owning a computer in 1998 was 30 percent greater than it was in 1994, and the total number of families in City X was 4 percent greater in 1998 than it was in 1994. What percent of the families in City X owned a personal computer in 1998 ?
A. 50%
A. 50%
B. 52%
C. 56%
D. 70%
E. 74%
这道题我是做“对”了,答案是A。但是我的做法是:假设The number of families in City X in 1994=XSo,percent of the families in City X owned a personal computer in 1998 =X*0.4*1.3/(X*1.04)=0.5
这种做法有个前提:One family owns one PC.这在题目中并没有交代。我个人没看出如果不设置前提的话可以怎么做,请大NN看看!
文中并没有这个前提,你在看看题干呢,是说X这个城市里面40%的家庭有一台计算机,(这里就说明不可能每一家都有一台计算机呢)98年有一台计算机家庭的数量比94年上升了30%.后面依次类推。X*0.4*1.3/(X*1.04)=0.5这个算式是对的。
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