What am I?

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

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Two men play a dice game involving roll of two standard dice. Man X says that a 12 will be rolled first. Man Y says that two consecutive 7s will be rolled first. The men keep rolling until one of them wins.

What is the probability that X will win ?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

Replace the question mark with the number below given a simple math problem.

What does a man do only once in his lifetime, but women do once a year after they are 29?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?