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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
2024-01-12
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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? [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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