1. There are 48 students in Class 6 (2) of Changjiang Road Primary School. Among them, there are 8 boys and 8 girls, accounting for 1/5 of the total number. Among the rest, there are five more girls than boys. How many boys and girls are there in this class?

For a fraction, the sum of numerator and denominator is 92. If both the numerator and denominator subtract 16, then the ratio of the numerator and denominator is 1: 3, so find the original fraction.

92- 16×2=60

1+3=4

60× 1/4= 15 15+ 16=3 1

60×3/4=45 45+ 16=6 1

A: The original score is 3 1/6 1.

3. The canteen bought two barrels of oil, the quality of which was 1.5 times that of the second barrel. If 65,438+0.2kg of oil is extracted from the first barrel and put into the second barrel, the amount of oil in the two barrels is the same. How many kilograms of oil are there in the first and second barrels?

The distance between cities A and B is 475 kilometers. The truck travels from city A to city B at a speed of 35 kilometers per hour. Five hours later, the bus traveled from B to A, and four hours later, the two cars met. How many kilometers does this bus travel per hour?

5. There are 240 students in the sixth grade of the experimental primary school, of whom 3/4 are boys, half are girls to attend the "Environmental Toastmasters", and the remaining 9 1 person to clean up. How many boys and girls are there in the sixth grade in this school?

6. The total age of the coach and two players of a football team is 100 years old. 12 years later, the age of the coach is the sum of the ages of the two players. How old is the coach this year?

7. Students go camping in the suburbs. At lunch, the monitor went to Mr. Wang to get a bowl. The teacher asked him how many bowls he got. He said 55 and asked, "How many people eat?" He said, "One person's rice bowl, two people's vegetable bowls and three people's soup bowls." Calculate, how many people does the monitor bring the bowl to?

8. There are 486 students in grade five or six in a primary school. It is known that the number of students in grade five is 1/5, which is 7 more than that in grade six. How many students are there in Grade 5 and Grade 6 respectively?

9.45 people can finish a project in a few days. After six days of work, nine people will be transferred to other projects for support, so they will be completed four days later than planned. How many days is it expected to be completed?

10. A car travels along a mountain road, with an average speed of 20 kilometers per hour up the mountain and 30 kilometers per hour down the mountain. Find the average speed of this car going downhill.

1 1. There are 9 boys in the school chorus, which is half less than that of girls, and girls are three times more than boys. How many people are there in this choir?