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

Can you solve the below geography rebus by decoding the below rebus ?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

I am quite hot but become too cold if you remove the first two letters. What am I?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

I have branches, but no fruit, trunk or leaves. What am I?

What number do you get when you multiply all of the numbers on a telephone's number pad?