题目内容

Stand in Line

　　You are waiting in a long line to get on a roller coaster(过山车). To make the time go faster you count the people ahead of you and find that you are the 38th in line. Then you look behind and feel pretty lucky because you count that you are the 56th from the end.

How many people are there in line?

Hints(提示)：

1．Use smaller numbers in the problem a couple of times to see if you can find a pattern(列式).

2．Drawing a diagram(图表) when using smaller numbers can help you find the pattern.

答案：
解析：

　　There are 93 people in line.

　　Using smaller numbers you can find a pattern: the number of people in line is 1 less than the sum(总数、和), of the numbers that give your position(位置).

　　For example, if you are the 2nd from the front and the 3rd from the end, the number of people would be 1 less than the sun of 2 and 3:

　　2+3=5；5－1=4. There would be four people in line.

　　38+56=94，94－1=93.


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Many students feel r 7 at lunchtime.Jamie Taylor.a 15-year-old student at an Oklahoma middle school,thinks that healthy foods often takes m8  time to eat.

“For example,it takes more time to c9  a whole apple than some applesauce[苹果酱]，and eating a salad takes longer than eating a cheeseburger or chicken nuggets”.Taylor said.”you always have to rush to the cafeteria and rush to eat every time.”

Besides,some kids eat their favorite foods first, and if they run out of time, those vegetables may get left behind..

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