How is the moon similar to a dollar?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

There is a jar in which there are two types of candies.
20 blueberries and 16 strawberries. You perform the following steps:
1) You take out two candies.
2) If the two candies are of the same flavour, you add a blueberry one otherwise, you add the strawberry one.

You repeat these two steps till there is just one candy remaining in the jar. Which flavoured candy will be left?

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

What has one letter and starts with an E?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

what does the below rebus means?

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

Why is the Hole below a Lock?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?