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  3. In 1970, if 5 percent of the water use was for domestic purposes, approximately what was the daily average number of gallons of

In 1970, if 5 percent of the water use was for domestic purposes, approximately what was the daily average number of gallons of

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问题 In 1970, if 5 percent of the water use was for domestic purposes, approximately what was the daily average number of gallons of water used per capita for domestic purposes?
If in 1900 the water use in Country K was the same as that in Country X, but increased at the constant rate of 3 billion gallons every year, then the two countries would again have had the same water use in approximately what year?
选项 A、1910
B、1920
C、1930
D、1940
E、1950
答案E
解析 若1900年K国的用水量与X国的相同，但K国以每年3 billion加仑的速度匀速增长，大约在哪年这两个国家的用水量会再次相同?
解：本题的正确答案为(E)。结合本题第一图，1900年X国和K国均消耗约50 billion加仑的水；对于K国，每十年的用水量增加30 billion加仑，大约到1950年两国消耗水的量会再次相同，约为200 billion加仑的水。
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