OG11-129，四舍五入

cathyliumei

OG11-129

On a recent trip, Cindy drove her car 290miles, rounded to the nearest 10miles, and used 12 gallons of gasoline, rounded to the nearest gallon. The actual number of miles per gallon that Cindy's car got on this trip must have been between 285/12.5 and 295/11.5.

rounded to the nearest 10 miles, 我觉得是285~294. 295近似到10miles 不就是300了吗？同理，rounded to the nearest gallon, 应该是11.5~12.4啊？望 同仁们指点一二。

jandjshi

 Cindy's car got on this trip must have been between
        285/12.5 and 295/11.5

这个between, 除非明显说是inclusive, 都算exclusive.

between 285/12.5 and 295/11.5 => 285/12.5 < X < 295/11.5, 不是<=

anjellacute

Cindy's car got on this trip must have been between
       285/12.5 and 295/11.5
这个between, 除非明显说是inclusive, 都算exclusive.
between 285/12.5 and 295/11.5 => 285/12.5 < X < 295/11.5, 不是<=

-- by 会员 jandjshi (2006/7/28 2:26:00)

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