Which tank will fill first?

Prove that the below maths equation is true.

8 + 8 = 91

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

In the four images below, can you find the odd one out?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Which is the smallest number that you can write using all the vowels exactly once?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Mr Black, Mr Gray, and Mr White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr Black, who hits his shot 1/3 of the time, gets to shoot first. Mr Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr Black, where should you shoot first for the highest chance of survival?

What always comes into a house through the keyhole?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.