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A man has some hens and some cows. If the total number of heads of hens and cows together is 50 and the number of feet of hens and cows together is 142, then the number of cows is
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- 21
- 25
- 27
- 29
- 21
Correct Option: A
Let the number of cows be p.
∵ A hen or a cow has only one head.
∴ Number of hens = 50 – p
A hen has two feet.
A cow has four feet.
According to the question,
4p + 2 (50 – p) = 142
⇒ 4p + 100 – 2p = 142
⇒ 2p = 142 – 100 = 42
| ⇒ p = | = 21 | |
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