In a cage, there are chickens and rabbits. Count their feet. There are 20 in total. How many chickens and rabbits are there in the cage?

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• 1. [math problem 2] chicken and rabbit are in the same cage. There are 100 legs of chicken and rabbit. If you change chicken into rabbit and rabbit into chicken, there are 86 legs. How many chickens and rabbits are there? Please use arithmetic. Or use the equation of degree 1, One more question: The Wutong tree planting tree, willow and poplar trees, 1800, planting trees, two more than willow, is 55% of Wutong tree, how many trees planted?
• 2. There are several chickens and rabbits in the cage. It is known that there are 28 heads and 86 legs. How many chickens and rabbits are there?
• 3. There are 12 heads and 40 feet in the same cage. How many chickens and rabbits are there in the cage?
• 4. There are 1400 tons of grain in warehouse A and warehouse B. warehouse a transports 12.5% of the grain in this warehouse, and warehouse B transports 100 tons. Now the two warehouses store the same amount of grain. How many tons of grain did warehouse a store?
• 5. 9999×9999×19999．
• 6. Three math problems 1) If the area of the triangle formed by the line y = 3x + m and the two coordinate axes is 6, try to find the value of M 2) Given the line y = (1 / 2) x + (K-6 / 2) and the line y = (- 1 / 3) x + (4K + 1 / 3), if their intersection is in the fourth quadrant, find the value range of K. (Note: the one in brackets represents a fraction, / is the fractional line, the numerator on the left, and the denominator on the right) 3) The intersection points of the line y = (5 / 4) x + B and X axis, Y axis are a and B respectively, and pass through the points (- 1, - 25). Find the number of points on the line AB (including a and B points), whose abscissa and ordinate are integers. (Note: the one in brackets represents a fraction, / is the fractional line, the numerator on the left, and the denominator on the right.)
• 7. Fill in 3, 6, 9, 12, 15, 18, 21, 24, 27 in the appropriate box, so that the sum of the three numbers in each horizontal, vertical, and oblique row is 45
• 8. The C + + program for finding the first 20 items of Fibonacci sequence is written by recursion. Fibonacci sequence is: 1,1,2,3,5,8,13,21 From the third
• 9. Find out the rule of number arrangement 2,5,7,4,7,5,3,6,? Find out the law of number arrangement 2,5,7 4,7,5 3,6,?
• 10. A math problem: a stands for a number, - a stands for what? - a must be negative? Brothers and sisters I have to do junior high school problems Sobbing
• 11. Chicken and rabbit in the same cage problem: there are a group of chickens and rabbits, the total number of legs is 2 times more than the total number of heads, 18, to find the number of rabbits Just tell me the formula and the solution
• 12. There are a group of chickens and rabbits. The total number of legs is more than twice the total number of heads. How many rabbits are there?
• 13. There are a group of chickens and rabbits. The total number of legs is more than twice the total number of heads. How many rabbits are there?
• 14. There are a group of chickens and rabbits. The total number of legs is more than twice the total number of heads. How many rabbits are there?
• 15. There are 56 workers in the Oriental wood factory There are 56 workers in Dongfang woodwork factory, each of whom can process 10 desks or 15 chairs per day on average. This factory has received a batch of tasks of processing desks and chairs, and requires one desk and two chairs to be matched into one set. To complete the task in the shortest time, how to arrange the number of workers (solve the equation) to process desks and chairs? Do not use the incomprehensible ones, or the fraction of them to solve the equation,
• 16. 1+1=?+5=?+56=?*798=?
• 17. 1. If (X-2) (2 of X + ax + b) contains no quadratic term, and the coefficient of the first term is - 3, find a and B 2. Given that the square 2 of (x + 2y-1) + | 2x-y-2 | 2 = 0, find the value of the square 2 of 4 (2x-y) - 2 (2x-y) (2x + y) + 1 / 4 (2x + y)
• 18. Simple calculation: 39 / 38 times 37 is equal to? Please write down the process and give your ideas
• 19. 39 degrees 48 points + 41 degrees 37 points 39 degrees 48 points + 41 degrees 37 points= 52 degrees 19 minutes 12 seconds = how many degrees 90 degrees 17 minutes - 47 degrees 52 minutes 2 seconds= 25 degrees 36 minutes * 4= 48 degrees 2 minutes / 5= It's the degree of the angle~
• 20. 36 + 37 + 38 + 39 +. + 50 = how much?