Question

Some Goats and hens are there in a room. The total number of them is 7,and total number of their legs are 20. How many hens and goats are there in that room?

Answer 1

Answer:

4 goats and 3 hens

Step-by-step explanation:

let no. of goats be x and no. of hens be y

x + y = 7  i)

4x + 2y = 20 ii) (since 1 goat has 4 legs and a hen has 2 legs)

multiply i) by 2

2x + 2y = 14 i)

from i) and ii)

2x + 2y = 14

4x + 2y = 20

-2x = - 8

x = 4

put x in i)

4 + y = 7

y = 3