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请问GRE猴哥112难题第80题Whenthepositiveintegernisdividedby7,thequotientisqandtheremainderis4.When2nisdividedby7,theremainderis1andthequotient,intermsofq,isAq/2Bq/2+1C2qD2q+1E2q+2

题目详情
请问GRE猴哥112难题第80题
When the positive integer n is divided by 7,the quotient is q and the remainder is 4.When 2n is divided by 7,the remainder is 1 and the quotient, in terms of q, is
A q/2 B q/2+1 C 2q D 2q+1 E 2q+2
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答案和解析
选D.
正整数n,除以7商q余4.
2n除以7余1,求以q表示的商.
2n除以7应该商2q余8,即为商2q+1 余1.