Hussein saw a total of sheep and ducks I a farm. If there were a total of 82 legs, how many ducks did he see?

Question

 Hussein saw a total of 23 sheep and ducks in a farm. If there were a total of 82 leg, how many ducks did he see?

Answer 1

d = number of ducks with 2 legs

s = number of sheep with 4 legs 

 

d + s = 23

2d + 4s = 82

 

Solve for d and s and get

 

d = 5

s = 18