问题 解答题

黄冈某地“杜鹃节”期间,某公司70名职工组团前往参观欣赏,旅游景点规定:①门票每人60元,无优惠;②上山游玩可坐景点观光车,观光车有四座和十一座车,四座车每辆60元,十一座车每人10元.公司职工正好坐满每辆车且总费用不超过5000元,问公司租用的四座车和十一座车各多少辆?

答案

设四座车租x辆,十一座车租y辆,则有:

4x+11y=70
70×60+60x+11y×10≤5000

将4x+11y=70变形为:4x=70-11y,代入70×60+60x+11y×10≤5000,可得:

70×60+15(70-11y)+11y×10≤5000,

解得y≥

50
11

又∵x=

70-11y
4
≥0,

∴y≤

70
11

故y=5,6.

当y=5时,x=

15
4
(不合题意舍去).

当y=6时,x=1.

答:四座车租1辆,十一座车租6辆.

阅读理解

Read the following passage. Complete the diagram by using the information for the passage. Write NO MORE THAN 3 WORDS for each answer.

Since it was founded a year ago, the babysitting pool has become increasingly popular in the United States. More and more mothers have joined it and have benefited from it. What attracts them most is the idea that you pay your babysitter not in cash, but in paper cards. When you join the babysitting pool, you are given thirty cards, which are worth 30-minute babysitting time each.  For each half an hour while you are gone, the babysitter gets paid one card.

There are rules regulating this service. You should not watch more than three kids at a time including your own. On big holidays, such as Christmas and Thanksgiving, the babysitter should be paid twice as much, which means two cards for every half an hour. When you leave the babysitting pool, you should return all the cards. If you are out of cards, you cannot use money instead. You should have to baby-sit for others to earn enough cards so that you will have them handy when you yourself need a babysitter.

Many mothers think highly of this service. It keeps children in constant touch with one another, and makes life easier for the mothers. Since in most cases, the babysitter is the mother who watches other kids at her own home, it is still possible for her to do her own things while the kids play with each other. In fact most mother babysitters find that their own kids are less of a monster and easier to watch when they are around other playmates. Moreover, since the babysitting pool service does not involve money, it will not be a financial loss to the family.

In the past year, the babysitting pool has helped so many mothers with their work that they all think that it is indeed a good community service worth keeping.

单项选择题