问题 解答题

某开发公司生产了若干件某种新产品需要精加工后才能投放市场,现有甲、乙两个加工厂都想加工这批产品.已知甲、乙两个工厂每天分别能加工这种产品16件和24件,且知单独加工这批产品甲厂比乙厂要多用20天.又知若由甲厂单独做,公司需付甲厂每天费用80元;若由乙厂单独做,公司需付乙厂每天费用120元.

(1)求这批新产品共有多少件?

(2)若公司董事会制定了如下方案:可以由每个厂家单独完成;也可以由两个厂家同时合作完成,但在加工过程中,公司需派一名工程师到厂进行技术指导,并由公司为其提供每天5元的午餐补助费,请你帮助公司选择一种既省时又省钱的加工方案,并通过计算说明理由.

答案

(1)设这个公司要加工x件新产品,由题意得:

x
16
-
x
24
=20,

解得:x=960(件),

答:这个公司要加工960件新产品;

(2)①由甲厂单独加工:需要耗时为

960
16
=60天,需要费用为:60×(5+80)=5100元;

②由乙厂单独加工:需要耗时为

960
24
=40天,需要费用为:40×(120+5)=5000元;

③由两场厂共同加工:需要耗时为

960
24+16
=24天,需要费用为:24×(80+120+5)=4920元.

所以,由两厂合作同时完成时,即省钱,又省时间.

阅读理解

Would you completely trust your friends if you couldn’t see anything? If you are falling, do you believe they will catch you and help you stand up? Our teacher helped us to find the answer.

Our teacher is named Morrie. One day, he said that he had a game for us to try. He divided us into two groups. One of the students from the first group, stands in front of us with his eyes closed, and then falls backwards(向后). The second group stand behind him. Before he falls on the floor, they should catch him and not let him get hurt. Most of us were uncomfortable with this. We were afraid that they wouldn’t catch us and we would hit the floor. So we didn’t move. We just stood there and laughed in embarrassment(尴尬).

Finally, one student, thin, quiet, dark-haired girl called Sarah, decided to move. She crossed her arms in front of her body, closed her eyes, and slowly fell backwards. She looked quiet but brave.

For a moment, I was sure she was going to fall on the floor. But before she hit the floor, the other students caught her, held her and finally helped her stand up.

“Whoa!!” we were all surprised, and also encouraged. The girl was happy, too. Seeing this, Morrie smiled and said to the girl, “When you close your eyes, you can’t see anything. You won’t feel safe. When you are falling, the feeling gets stronger. You are not sure whether you will hit the cold, hard floor or the warm, soft hands of your friends. But if you are brave enough to trust them, they won’t let you down.”

小题1:According to the passage, we can know Morrie is ___________.

A.a student

B.a teacher

C.a manager

D.a farmer小题2:The writer thought the girl was ___________.

A.strong but shy

B.active

C.quiet but brave

D.careless小题3:In the end, the girl ___________.

A.got hurt

B.fell on the floor

C.was only helped by the writer

D.was caught by the other students小题4:The students felt encouraged because ___________.

A.they could stop the game finally

B.they wanted to do something else

C.they thought they had won the game

D.they felt that they could trust each other

单项选择题