Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

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

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

Prove that twice of ten is the same as twice of eleven.

John can eat 27 chocolates in an hour, Jacob can eat 2 chocolates in 10 minutes, and Jolly can eat 7 chocolates in 20 minutes. How long will it take them to share and eat a box of 120 chocolates whilst playing Chess?

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

Why are televisions attracted to people?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Why is 6 afraid of 7?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?