The number Garry left was greater than 3 but less than 9, so it must be one of the following: 4, 6, or 8. Additionally, the number must be even, which means it could be 4, 6, or 8.
The key clue is that the number, when reversed, should look like another number. Reversing 6 gives 9, which satisfies this condition. Therefore, the number Garry left is 6
BRICK : MASONRY :: TILES : ________
Arun’s present age in years is 40% of Barun’s. In another few years, Arun’s age will be half of Barun’s. By what percentage will Barun’s age increase during this period?