A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

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

Solve below popular number sequence
314 159 265 358 979 323 846 ?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

I am an odd number. Take away a letter and I become even. What number am I?

Can you find out the remainder when 3^300 is divided by 5?

Can you solve below mathematical equation?

2^1234 - 2^1233

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

Our product and our sum always give the same answer. Who are we?