other Maths Puzzle Verbal Ability

Shakeel wants to spend all his money on sweets. He has enough to buy three small laddus. With the same amount, however, he can buy two large laddus, each of which is 60% larger than a small laddu. What would you advise him to do?

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other Other Question

We say that a set of rooks dominate the chessboard if each square is either occupied by a rook, or can be directly attacked by a rook. Obviously the smallest number of rooks which can dominate an 12*12 chessboard is 12, which we can achieve by placing them along the main diagonal.

In 3-dimensional chess, rooks can attack in a straight line in the direction of the coordinate axis. What is the minimum number of rooks which can dominate an 12*12*12 chessboard?
In 2013, Bill Gates earned $11.5 billion dollars through his business activities and investments. Assume that he earns that money at a steady rate, working 365 days a year, 24 hours a day.

If he happened to drop $1,000 in cash while walking in the street, how long will it take for him to earn it back?