I am an odd number. Take away a letter and I become even. What number am I?

Two friends were stuck in a cottage. They had nothing to do and thus they started playing cards. Suddenly the power went off and Friend 1 inverted the position of 15 cards in the normal deck of 52 cards and shuffled it. Now he asked Friend 2 to divide the cards into two piles (need not be equal) with equal number of cards facing up. The room was quite dark and Friend 2 could not see the cards. He thinks for a while and then divides the cards in two piles.

On checking, the count of cards facing up is same in both the piles. How could Friend 2 have done it ?

Whats the next number in the below number sequence pattern.

What does the below image rebus riddle means ?

Replace the question mark with the correct number in the below-given picture?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Can you count the number of squares in the figure below?

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

Jack and Joseph are well-known golf rivals. One Day during a match, they were level at a score of 30. Jack hit a bad shot and Joseph added 10 to his score. Joseph then hit an awesome shot and he won the game.

How ?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?