求解两道数学题

guchaoUID: 2931614

98.11的section5
14.The 20 pepole at a party are divided into mutually exclusive groups in such a way that the number of people in any group does not exceed the number in any other group by more than 1.

The value of n if at least one of the groups consists of 3 people            6

99.4 section4
28. A developer has land that has x feet of lake frontage. The land is to be subdivided into lots, each of which is to have either 80 feet or 100 feet of lake frontage. If 1/9 of the lots are to have 80 feet of frontage each and the remaining 40 lots are to have 100 feet of frontage each, what is the value of x?


题读的有点晕，请各位大神帮帮呀

hua11UID: 3027785

第1题见帖：https://bbs.gter.net/viewthre ... age=1#pid1775207526

hua11UID: 3027785

根据余下的8/9为40，知lots总数为45，故5*80+40*100=4400

guchaoUID: 2931614

4# hua11
谢谢斑斑

guchaoUID: 2931614

今天又攒了一堆问题来求助了~~呼呼
98.11 section2
27. certain doctor suggests that an individual's daily which intake be 1/2 ounce per pound of body weight plus 8 ounces for every 25 pounds by which the individual exceeds his or her ideal weight. If this doctor suggests a daily water intake of 136 ounces for a particular 240-pound individual, how many pounds above his or her ideal weight is that individual?

30. In a group of 80 students, 24 are enrolled in geometry, 40 inbiology, and 20 in both. If a student were randomly selected from the 80 students, what is the probability that the student selected would not be enrolled in either course?

98.4的section6
16. For a certain telephone company, it is projected that next year 2 out of every 3 new telephone numbers will be assigned to cellular telephones. If the company projects that a total of 1,200,000 new telephone numbers will be assigned next year, how many of these numbers are projected to be assigned to cellular telephones?这个题读不懂

20.Art, Bob, and Carmen share a prize of $400. Bob receives 1/2  1/2 as much as Carmen, how If Art receives twice as much as Bob, and if much does Carmen receive? 我的白皮上是这么印的，应该印错了吧，看不明白