A box contains 5 apples, 6 oranges and 'x' bananas. If the probability of selecting an apple from the box is $1 / 3$ then the number of bananas is ____________ .
Two numbers 'a' and 'b' are selected, successively without replacement in that order, from integers 1 to 10. The probability that a/b is an integer, is ____________ .
A girl calculates that the probability of her winning the first prize in a lottery is 0.08. If 6000 tickets are sold, then the number of tickets she bought, is ____________ .
If one natural number is selected from the first 70 natural numbers, the probability that it is a solution of the inequation 3x - 2 > x + 42 is ____________ .
An urn contains 9 red balls and x green balls. If the probability of picking a red ball is thrice that of picking a green ball, then x = ____________ .