1. For a project, 18 people can work for 20 days, 12 hours a day. Ten days after the start of the project, they decided to complete the project three days ahead of schedule, reducing the daily working time by a quarter, How many people can complete the construction? 2. In grade five, there are 35 people who love music, 28 people who love art and 5 people who don't like anything. How many people are there in this class? 3. There are 50 people in class 6-2, including 34 people who like to eat apples, 29 people who like to eat pears, 32 people who like to eat bananas, 15 people who like to eat apples and pears, and 12 people who like to eat apples and bananas. There are no three kinds of apples and no three kinds of bananas. How many people love both pears and bananas? 4. In the natural numbers from 1 to 50, how many numbers can't be divided by 3 or 5? 5. There are 100 soldiers in an infantry company, 80 of them can play chess, 75 of them can play cards, 70 of them can play go, and 82 of them can play mahjong. How many of them are there in all four kinds? 6. The school organizes tree planting activities. 20 people work for 20 days, 15 hours a day, and can complete a piece of land 180 meters long and 20 meters wide. Now 30 people work one third longer every day. How many days does it take to complete a piece of land 360 meters long and 30 meters wide They all use formulas, not equations, but there's no difference. 555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555

1. For a project, 18 people can work for 20 days, 12 hours a day. Ten days after the start of the project, they decided to complete the project three days ahead of schedule, reducing the daily working time by a quarter, How many people can complete the construction? 2. In grade five, there are 35 people who love music, 28 people who love art and 5 people who don't like anything. How many people are there in this class? 3. There are 50 people in class 6-2, including 34 people who like to eat apples, 29 people who like to eat pears, 32 people who like to eat bananas, 15 people who like to eat apples and pears, and 12 people who like to eat apples and bananas. There are no three kinds of apples and no three kinds of bananas. How many people love both pears and bananas? 4. In the natural numbers from 1 to 50, how many numbers can't be divided by 3 or 5? 5. There are 100 soldiers in an infantry company, 80 of them can play chess, 75 of them can play cards, 70 of them can play go, and 82 of them can play mahjong. How many of them are there in all four kinds? 6. The school organizes tree planting activities. 20 people work for 20 days, 15 hours a day, and can complete a piece of land 180 meters long and 20 meters wide. Now 30 people work one third longer every day. How many days does it take to complete a piece of land 360 meters long and 30 meters wide They all use formulas, not equations, but there's no difference. 555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555

1. Using the normalization method, first find out how many hours a person needs to complete all
18 × 20 × 12 = 4320 (hours)
4320 × (1-10 / 20) = 2160 (hours)
(20-10-3) × [12 × (1-1 / 4)] = 7 × 9 = 63 (hours)
2160 △ 63 ≈ 35 (person)
2. 35 + 28 + 5 = 68 (people)
3. Drawing three circles intersection analysis
Number of people who like bananas or pears, excluding apples: 29 + 32 - (15 + 12) = 34 (people)
Number of people who don't like apples: 50-34 = 16
Number of people who love both pears and bananas: 34-16 = 18
4. Analysis: the number that can be divided by 3: 50 △ 3 = 16 (pieces) two
Number divisible by 5: 50 △ 5 = 10
The number that can be divided by both 3 and 5: 50 (3 × 5) = 3 (pieces) five
Therefore, the number of numbers that cannot be divisible by 3 or 5: 50-16-10 + 3 = 27
5. The analysis method is the same as two questions
6. Analysis: work out the work efficiency per person per hour first
180 × 20 ÷ (20 × 20 × 15) = 0.6 (M2)
30 × [15 × (1 + 1 / 3)] × 0.6 = 360 (M2)
360 × 30 △ 360 = 30 (days)

For a project, 20 people are planned to work and it can be completed in 18 days. Now, due to other tasks, only 12 people are sent to process

Total work divided by number of people = actual working days
20*18/12=30
Actual 30 days to complete

To produce a batch of parts, 24 people work and 18 days can be completed. If 12 people work more, how many days can be completed? (use proportion solution)

24*18=(24+12)X
Find x
x=12
The ratio is 24 / (24 + 12) = x / 18

If a number is increased by 15 or 15, then the number is ()
A. 17B. 16C. 15

A: the number is 16. So the answer is: B