A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

They are three errirs in this question. Can you find them?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

What has one letter and starts with an E?

Before Mount Everest was discovered, what was the highest mountain in the world?