If it took eight men ten hours to build a wall, how long would it take four men to build it?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

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?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

A new clothing store has a unique method of pricing items. A vest costs $20, a tie costs $15, a blouse costs $30, and underwear costs $45. How much would pants cost?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Can you find the 09 errors in the picture below?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?