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  3. A school district has 1,989 computers, which is approximately one computer for e

A school district has 1,989 computers, which is approximately one computer for e

游客2024-01-12  46
问题 A school district has 1,989 computers, which is approximately one computer for every 68.6 students. Of the following, which is the closest approximation, in thousands, of the number of students in the school district?
选项 A、30
B、120
C、140
D、160
E、200
答案 C
解析 一校区有1989台计算机，大约为68.6名学生一台，以千为单位，下面哪一项最接近校区的学生数?
解：本题的正确答案为(C)。此题比较简单，大多数的考生都会这样来解这道题：由平均68.6人一台电脑可得该校区共有1989×68.6≈136,445≈140,000名学生。但是考生要注意的一点是，本题只是让求近似解，因此可以通过取近似值的办法来大大简化计算过程，1989≈2000，68.6≈70，由此可以口算出该校区学生人数为140千。
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