Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

What jumps when it walks and sits when it stands?

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

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

Two brothers were watching a horror film on video late one night. One brother dozed off and dreamed that he was being chased by the crazy man from the movie, who was trying to kill him. In the dream, he hid in a cupboard. There was no sound except his heart pounding, and he had no idea where his crazed captor was. He was terrified! At that moment, the video finished, and his brother put his hand on the shoulder of his sleeping sibling to wake him. The shock at that tense moment was enough that the sleeping brother suffered a massive heart attack and died instantly. True or false?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?