Can you count the number of triangles in the given picture?

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.

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

Solve this tricky question. You are trapped in a forest. With you, you have a gun preloaded with two bullets in it. In front of you, there is a tiger, a leopard and a jaguar.

How do you survive?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

By using 'because' continuously three times, can you make an English statement ?

What is so fragile that saying its name breaks it?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.