AMC8 1996
AMC8 1996 · Q9
AMC8 1996 · Q9. It mainly tests Linear equations, Fractions.
If 5 times a number is 2, then 100 times the reciprocal of the number is
如果一个数的5倍是2,那么该数的倒数的100倍是
(A)
2.5
2.5
(B)
40
40
(C)
50
50
(D)
250
250
(E)
500
500
Answer
Correct choice: (D)
正确答案:(D)
Solution
Let n be the number. 5n=2 so n=2/5. Reciprocal 5/2, 100*(5/2)=250.
设该数为n。5n=2,所以n=2/5。倒数5/2,100*(5/2)=250。
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