2. 外语
  3. If 2x = 3y = 4z = 20, then 12xyz =

If 2x = 3y = 4z = 20, then 12xyz =

admin2014-08-13  9
问题 If 2x = 3y = 4z = 20, then 12xyz =
选项 A、16000
B、8000
C、4000
D、800
E、10
答案C
解析 One approach you can use to solve this problem is to find the values of all three variables.
2x = 20,or x = 10
3y = 20, or y = 20/3
4z = 20, or z = 5
So 12xyz = 12(10)(20/3)(5)= 4,000, and the correct answer is Choice C.
    Another approach you can use to solve this problem is to notice that 12xyz == 4,000. Therefore, the correct answer is Choice C.
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