Question:In a group of cows and hens, the number of legs are `14` more than twice the number of heads. The number of cows is 

A `5` 
B `7` 
C `10` 
D `12` 

+ Answer
B 

+ Explanation
Let the number of cows be x and the number of hens be y.Then,

`4x + 2y = 2(x +y) + 14`

`or 2x + (2x + 2y)`

`= (2x + 2y) + 14`

`or 2x = 14`

`or x = 7`.

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Irin Moni

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