What goes up but never comes down?

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

Can you solve this picture maths equation?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

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

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

What always comes into a house through the keyhole?

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

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

Can you count the number of blocks in the picture below?