What is the word or phrase?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

Solve the mathematical equation in the picture below.

On a bright sunny day, two fathers took their son fishing in the lake. Each man and son were able to catch one fish. When they returned to their camp, there were only three fishes in the basket. What happened?

PS: None of the fish were eaten, lost, or thrown back.

What does an Island and the letter T have in common?

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

Can you count the number of quadrilaterals in the picture below?

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