Find the next two terms of series : 32 31 32 29 32 27 32 .. ..

Explanation: This is an alternating repetition series. The number 32 alternates with a series in which each number decreases by 2.

If one-third of one-fourth of a number is 15, then three-tenth of that number is:

Explanation: Let the number be x.
Then, 1/3 of 1/4 of x = 15 <=> x= 15*12 = 180.
So, required number = 3/10*180 = 54

Petal: Flower::

Explanation: A petal is a part of a flower; a tyre is a part of a bicycle.

QPO, NML, KJI, _____, EDC

Explanation: This series consists of letters in a reverse alphabetical order.

Which one of the following is not a prime number?

Explanation: 91 is divisible by 7. So, it is not a prime number.