The Marginal Physical Product (MPP) is maximum

If all the digits of each number are added, the sum of which number will be the largest?

If digits of each number are added and sum is multiplied by 2, and the resultants are arranged in descending order, which number will be at last position?

Four number-sets have been given, out of which three are alike in some manner and one is different. Select the number-set that is different.

If digits of each number are arranged is ascending order from, how many number/ numbers thus formed would be perfect square/ squares?

If third digit of each number is replaced by 7, then how many numbers will be divided by 7?

Select the option in which the numbers are not related in the same way as are the numbers of the following set.

68, 84, 42