OG上的几道让我摸不着头脑的题，求解答

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 nearst 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.295/12.5and 285/11.5

In a nationwide poll,N people were interviewed.If 1/4 of them answered "yes"to question 1,and of those,1/3 answered "yes"to question 2,which of  the following expression represents the number of people interviewed who did not answer "yes"  to both question?

A.N/7

B.6N/7

C.5N/12

D.7N/12

E.11N/12

A store currently charge the same price for each towel that it sells.If the current price of each towel were to be increased by$1,10 fewer of the towels could be bought for $120,excluding sales tax.What is the current price of each towel?

A.$1

B.$2

C.$3

D.$4

E.$12

主要是题目没有看懂，不难计算

1 rounded to 10是大约的意思，用来修饰前面的290，也就是大约在290上下5的范围，同理下一个也是。问最后的范围。

2 “those”是指在四分之一的回答第一题yes的中又有三分之一的人回答第二个问题yes.

3 如果每条毛巾多一元，则少买了10条，设现价为x,不涨价前可买y条，可列方程组

xy=120,(x+1)(y-10)=120.

Thanks a lot,really make sense!

Thank very much!