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  3. Two hundred multiples of seven are chosen at random, and 300 multiples of eight

Two hundred multiples of seven are chosen at random, and 300 multiples of eight

游客2024-01-14  69
问题 Two hundred multiples of seven are chosen at random, and 300 multiples of eight are chosen at random. Approximately what percentage of the 500 selected numbers are odd?
选项 A、20%
B、25%
C、40%
D、5O%
E、80%
答案 A
解析 All multiples of 8 are even, and half of the multiples of 7 are odd; the multiples of 7 make up 2/5 of the total, so if 1/2 of those multiples of 7 are odd, then 1/5 of the total will be odd, or 20%.
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