“五一”黄金周期间，某学校计划组织385名师生租车旅游，现知道出租公司有42座和60座两种客车，42座客车的租金每辆为320元，60座客车的租金每辆为460元。
（1）若学校单独租用这两种车辆各需多少钱？
（2）若学校同时租用这两种客车8辆（可以坐不满），而且要比单独租用一种车辆节省租金，请你帮助该学校选择一种最节省的租车方案。
解：（1）385÷42≈9.2，
∴单独租用42座客车需10辆，租金为320×10=3200元，
385÷60≈6.4，
∴单独租用60座客车需7辆，租金为460×7=3220元，
（2）设租用42座客车x辆，则60座客车（8-x ）辆，由题意得：
解之得：
，
∵x取整数，
∴x =4，5，
当x=4时，租金为320×4+460×（8-4）=3120元；
当x=5时，租金为320×5+460×（8-5）=2980元，
答：租用42座客车5辆，60座客车3辆时，租金最少。
| Directions: Read the following text and choose the most suitable heading from A-AC for each paragraph. There is one extra heading which you do not need.
Polynesians, but since the 1960s anyone and everyone can go surfing. 1. Surfing is more of a way of life for some people than simply a sport, and many spend their time travelling around the planet in search of the perfect wave. Typically, the average surfer is a relaxed type of person: they say it's something about the art of catching waves and being out in the elements that makes you feel very relaxed. Surfers greet each other by saying "Howzit?" (a bit like "How's it going?") and sometimes call each other "bru" or "brah" from the Hawaiian word for brother, "braddah". British surfers travel in WV camper vans and look a bit like hippiest. 2. Anywhere that has a coastline with big waves is home to surfers. Half of Australia's coastline is surfable so there are lots of Australian surfers. Hawaii is where the sport was invented and the current champion is Hawaiian Sunny Garcia. A lot of surfers also come from California and New Zealand. There are even surfers in the UK who hang out on the southwest coast where the Atlantic waves hit the shore. 3. Get a board. Most surfers start on short boards. Long boards and guns are only for experienced surfers catching huge waves. You also have to be a very strong swimmer: being able to swim at least 100 meters, and 25 meters underwater is required. 4. Beach breaks are waves which fall onto sand. They can be big, but are best if you are a beginner. Waves vary in size during different seasons and even at different times of the day, so watch out! Surfing can be dangerous and you need advice from someone experienced. More experienced surfers catch waves at point and reef breaks. They are away from the coast, and the swell comes deep from the ocean. Point breaks are waves bent because of the shape of the land beneath the ocean, and reef breaks are shaped by coral and rocks. 5. Surfing is a dangerous sport if you aren't a strong swimmer or if you try to do too much. The main thing most surfers have to worry about is their own board or other surfers' boards. Great white sharks, stingrays and deadly jellyfish are also not friendly to surfers, but actually running into one of these is quite rare. |