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

Can you find the key in the picture below?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Why do we preferably have round manhole covers and not square ones?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

The cream is heavier than Milk. True or False?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?