Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

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

Name a key which is hardest to turn.

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

What will you call your mother's brother's brother-in-law?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

What happened when the wheel was invented?