Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Joseph buys three kinds of chocolates for 100 rupees. The first one is priced at 5 rupees, second one at 3 rupees and third one at 0.5 rupees.

If he bought 100 chocolates in total, how many pieces do you think he bought each chocolate?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?