In a farm there are hens and cow. If the heads are counted there are 200 and if the legs are counted there are 580. How many hens are there?
A90
B100
C110
D120
Answer:
C. 110
Read Explanation:
Hens are represented by H and cow by C
H + C = 200 ..... (1)
2H + 4C = 580 ..... (2)
(1) × 4
4H + 4C = 800 ... (3)
(3) - (2) =
2H = 220
H = 220/2 = 110