# Arithmetic Aptitude :: Problems on Numbers

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## 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.

Then,

=> 4x + 2y = 2(x + y) = 16.

=> 2x + (2x + 2y) = (2x + 2y) + 16.

=> x = 8.

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