题库搜索>问题求解PS-13213
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?
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分析E选项
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X: 1994 40%x有个人电脑
X: 1998 （1+30%）40%x
X: 1998 一共有（1+4%）x 人
所以最后应该是:1998年拥有电脑的人：13/25x
1998年一共有的人数是：25/26x
两数相除：1/2
1713
这题的巧妙之处在于估算，假设人口数量不变，增加30%，则拥有电脑占比40%*（1+30%）=52%，但人口基数也增了，所以一定小于52%，只能选A
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2018-07-29 22:28:18
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% # of Families # of families owning a pc 1994 40 1 0.4 1998 ? 1.04 (4%) 0.52 (0.4*1.3) (30%) 所以 ? = 0.52/1.04 = 50%
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2017-11-22 12:02:54
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