A farmer has a total of 200 ducks and cows in his barn. If he has n cows, how many total legs are there in the barn? (Make sure you include the farmer.)
Total legs = 4n + 400 - 2n + 2
Total legs = 2n + 402
- Number of cows = n
- Legs per cow = 4
- Cows legs = 4n
- Number of ducks = 200 - n
- Legs per duck = 2
- Number of ducks legs = (200 - n) x 2 = 400 - 2n
- Farmers legs = 2
Total legs = 4n + 400 - 2n + 2
Total legs = 2n + 402