Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Can you spot the hidden girl in the picture below?

Can you spot the man between the coffee bean in the picture below ?

I can write cow in 13 letters.

Can You?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Find the next number in the series.
1 10 24 43 67 ?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

There are hundred red gems and hundred blue gems. The blue gems are priceless while the red gems equal wastage. You have two sacks one labeled Heads and the other Tails. You have to distribute the gems as you want in the two sacks. Then a coin will be flipped and you will be asked to pick up a gem randomly from the corresponding sacks.

How will you distribute the gems between the sacks so that the odds of picking a Blue gem are maximum?