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A researcher has found that the number of work hours needed to type in 5 words i
A researcher has found that the number of work hours needed to type in 5 words i
游客
2024-01-12
7
管理
问题
A researcher has found that the number of work hours needed to type in 5 words is directly proportional to the square root of s. If 2 work hours are needed to type in 2000 words, how many hours are needed to type in 4000 words?
选项
A、
B、
C、
D、
E、
答案
A
解析
第一句话中有比例表达“directly proportional to”。定位成比例的两个数量为the number of work hours needed to type in s words(输入s个单词所需要的工作时间)和the square root of s(
)。设工作时间为t,比例为k,则转化为表达式t=
。因为输入2000个单词需要2小时,所以2=
,解得k=
。则输入4000个单词需要的时间
选择A选项。
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