What month of the year has 28 days?

Find out the missing number in the picture attached:

If eleven plus two equals one, what does nine plus five equal?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Which five letter word can be added at the end of below word to form a
valid word?

> Pin
> Check
> Boiling
> View

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

Can you identify if it's a murder or a suicide ?

Replace the question mark in the picture below.