Can you make four (4) nines (9) equal 100?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

You need to arrange three 7 and mathematical symbols to form number 1?

What makes this number unique: 8,549,176,320?

You need to remove two matchsticks to make the below equation true. Can you do it ?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

You have two jars of chocolates labelled as P and Q. If you move one chocolate from P to Q, the number of chocolates on B will become twice the number of chocolates in A. If you move one chocolate from Q to P, the number of chocolates in both the jars will become equal.

Can you find out how many chocolates are there in P and Q respectively?