Solve the mathematical equation in the picture below.

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

The host of a game show offers the guest a choice of three doors. Behind one is an expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Can you place three balls such that the equation shown in the picture holds true?

Why do Chinese men eat more rice than Japanese men do ?

What is next number in the pattern below:

131 517 192 123 ?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.