How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

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?

How many times in a given day, minutes and hour clock comes in a straight line ?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

It belongs to you, but other people use it more than you do. What is it?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

A man died, leaving $10,000,000 for his widow, 5 sons and 4 daughters. Each daughter received an equal amount, each son received twice as much as a daughter, and the widow received three times as much as a son.

How much did the widow receive?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.