Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

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?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

The dirtier I get, the whiter I look. Who am I?

What is full of holes but still holds water?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Replace the question mark with the correct number.

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

Using eight eights and addition only, can you make 1000?