An orphaned kitten was only 4 inches when he was found. In the next two weeks, he doubled in length, and by 4 months old, he had double in length again. What is its current length? Let's be accurate as possible.
In two weeks, the kitten measured 4 x 2 = 8 inches. 4 months later, the kitten measured 8 x 2 = 16 inches.
The answer: 16.