The chickens and rabbits fed by Grandma's family have 20 heads and 52 feet. How many chickens and rabbits did grandma's family feed

The chickens and rabbits fed by Grandma's family have 20 heads and 52 feet. How many chickens and rabbits did grandma's family feed

20 * 4-52 = 28
28 / (4-2) = 14 chickens
20-14 = 6 rabbits

Granny Wang raised chickens and rabbits. Xiao Ming asked: how many chickens and rabbits did she raise? Granny Wang said: chickens and rabbits have 25 heads and 70 feet
How many chickens and rabbits are there? Two hypotheses, one equation

Suppose that all chickens are: 25 * 2 = 50, 70-50 = 20, 4-2 = 2, 20 / 2 = 10 (rabbits), 25-10 = 15 (chickens). Suppose that all rabbits are: 25 * 4 = 100, 100-70 = 30, 4-2 = 2, 30 / 2 = 15 (chickens), 25-15 = 10 (rabbits)

Aunt Wang raised many chickens and rabbits. It is known that there are 13 more chickens and 16 more feet than rabbits. How many chickens and rabbits are there?

Suppose there are x rabbits, then there are (x + 13) chickens, (x + 13) × 2-4x = 16 & nbsp; & nbsp; & nbsp; & nbsp; 2x + 26-4x = 16 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 2x = 10 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 5, then there are 13 + 5 = 18 chickens and 5 rabbits