Which is Odd One Out and why?

4377

3954

9862

8454

9831

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Which tank will fill first?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Can you spot the hidden girl in the picture below?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months