What is full of holes but still holds water?

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

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

what's the probability of getting a king or a queen from a pack of 52 cards?

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

What does below rebus means ?

What does this rebus means ?

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?