Okay..I have seen multiple threads of this question but no clear explanation has yet been provided..so opening the post again..I would like the experts to give a detailed explanation.
Posting the question again(there was a typo previously):
On a recent trip, Cindy drove her car 290 miles,
rounded to the nearest 10 miles, 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
(A) 290/12.5 and 290/11.5
(B) 295/12 and 285/11.5
(C) 285/12 and 295/12
(D) 285/12.5 and 295/11.5
(E) 295/12.5 and 285/11.5
290 miles rounded to the nearest 10 miles: b/w 285 and 294
12 gallons rounded to the nearest gallon:b/w 11.5 and 12.4
worst possible mileage would happen with fewest miles traveled and the greatest gasoline consumption, and the best possible mileage would be the opposite.
whch should make it 285/12.4 and 294/11.5 which does not match with the OA.
The problem seems to arise from the word "between".