Solution: Solution:

2X-X=50 3X-(3+9)X=30

Solution: Solution:

1, the circumference of the rectangle is 9.8 cm, and the known length is 0.5 cm more than the width. What is the length, width and area of this rectangle? 1. To transport 29.5 tons of coal, transport it three times by a truck with a load of 4 tons, and transport the rest by a truck with a load of 2.5 tons. How many times will it take to complete?

2. The trapezoidal site covers an area of 90 square meters, with an upper bottom of 7 meters and a lower bottom of 1 1 meter. How high is it?

A workshop plans to produce 5480 parts in April. It has been in production for 9 days, and 908 more are about to complete the production plan. How many pieces will be produced on average every day in these 9 days?

4. Two cars, Party A and Party B, are driving in opposite directions from two places 272km apart. Three hours later, the distance between the two cars is still 17km. A travels 45 kilometers per hour, and B travels how many kilometers per hour?

5. There are two classes in grade six in a school, and the average score of mathematics last semester is 85. There are 40 students in six classes (1) with an average score of 87. 1. There are 42 students in Class Six (2). What is the average score?

6. The school bought 10 boxes of chalk. 250 boxes were used, and there are 550 boxes left. How many boxes per box?

There are 200 students in the fourth grade. During extracurricular activities, 80 girls went to jump rope. The boys are divided into five groups to play football. How many people are in each group?

8. The canteen brought 150 kg of rice, which was 30 kg less than the flour. How many kilograms of flour does the canteen send?

9. There are 52 peach trees and 6 rows of pear trees in the orchard. There are 20 more pear trees than peach trees. How many pear trees are there in each row on average?

10, the area of a triangle is 840 square meters, the base is 140 meters, and the height is how many meters?

1 1, Li Shifu bought 72 meters of cloth to make 20 clothes for adults and 16 clothes for children. Adult dresses are 2.4 meters each, and how many meters are children's dresses?

12, three years ago, my mother was six times older than my daughter. This year, my mother is 33 years old. How old is my daughter?

13. How long will it take for a car with a speed of 50 kilometers per hour to catch up with a car with a speed of 40 kilometers per hour that left two hours ago?

14. Xiaodong bought 3 Jin of apples and 2 Jin of pears at the fruit shop and paid 15 yuan. 1kg apples are more expensive than 1kg pears in 0.5 yuan. How much are apples and pears per kilogram?

15, A and B start from A and B at the same time, respectively, in opposite directions. A travels at a speed of 50 kilometers per hour, and B travels at a speed of 40 kilometers per hour. A reaches the midpoint 1 hour earlier than B. How many hours does it take for A to reach the midpoint?

16, Party A and Party B set out from A and B at the same time, face to face, and meet two hours later. If A starts from place A and B goes in the same direction at the same time, then A will catch up with B after 4 hours. Given that the speed of A is 15km/, find the speed of B. ..

17, two ropes with the same length, the first one was cut15m, and the second one was 3m more than the first one. How long are these two ropes?

18, a school bought 7 basketballs and 10 soccer balls and paid 248 yuan. As we all know, the price of each basketball is equivalent to the price of three footballs. How much is basketball and football each? Five times the quotient. X minus 2.5 divided by 5, the difference is 38. Find X.

19, a number plus 25 equals the difference between 1 10 and 75. What's this number?

The product of 20, 5 and 9 minus three times a number is 2. 1. Find this number.

2 1, 3 times of a number is less than 5 times of it, 1.8, find this number.

The fruit shop sent 30 baskets of apples and 25 baskets of pears. Apple I is 25 kilograms heavier than pear. As we all know, each basket of apples weighs 30 kilograms. How many kilograms does each basket of pears weigh?

23. The children's bookstore brought 15 kinds of story books, each with 30 books. Some were sold, and there were 120 copies left. How many story books have been sold?

24. The area of a square is equal to the area of a triangle. As we all know, the side length of a square is 6 decimeters, and the bottom of a triangle is 9 decimeters. What is the height of this triangle?

25. Team A and Team B process 1680 parts in 6 days, and Team A processes 144 parts every day. How many parts does Team B process every day?

There are 3000 chickens and ducks in the chicken farm. There are three times as many chickens as ducks. How many chickens and ducks are there?