Can you find the thief by just looking at the picture below?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

Replace the question mark with the correct number in below Picture:

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

Can you write down eight eights so that they add up to one thousand?

John was gifted a new Hayabusa. He drove x miles at 55mph. Then he drove x+20 miles at 40mps. He drove his bike for 100 minutes. How much distance did he travel?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Can you solve the below tricky visual equation?