What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

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

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

What demands an answer, but asks no questions

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

I make two people out of one. What am I?

A man dies of old age on his 25 birthday. How is this possible?