TCS Company Numerical Ability Geometry

Planet fourfi resides in 4-dimensional space and thus the currency used by its residents are 3- dimensional objects.
The rupee notes are cubical in shape while their coins are spherical. However the coin minting machinery lays out some
stipulations on the size of the coins.
The diameter of the coins should be at least 64mm and not exceed 512mm. Given a coin, the diameter of the next larger
coin is at least 50% greater.The diameter of the coin must always be an integer.
You are asked to design a set of coins of different diameters with these requirements and your goal is to design as many coins as possible.
How many coins can you design?

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TCS Other Question
70 54 45 41? Alok and Bhanu play the following min-max game. Given the expression N=40+X+Y-Z, where
X, Y and Z are variables representing single digits (0 to 9), Alok would like to maximize N while Bhanu would like to minimize it.
Towards this end, Alok chooses a single digit number and Bhanu substitutes this for a variable of her choice (X, Y or Z).
Alok then chooses the next value and Bhanu, the variable to substitute the value. Finally Alok proposes the value for the remaining variable.
Assuming both play to their optimal strategies, the value of N at the end of the game would be