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  3. In 1970, if 5 percent of the water use was for domestic purposes, approximately

In 1970, if 5 percent of the water use was for domestic purposes, approximately

游客2025-02-24  27
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? [br] 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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