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Arithmetic Aptitude :: Problems on Numbers

7. In a group of donkeys and pigs, the numbers of legs are 16 more than twice the number of heads. The number of donkeys is

Answer: Option B

Explanation :

Let the number of donkeys be x and the number of pigs be y.
=> 4x + 2y = 2(x + y) = 16.
=> 2x + (2x + 2y) = (2x + 2y) + 16.
=> x = 8.

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