1. How can you make 24 using only the numbers 5, 5, 5, and 1, employing each number only once? You can only add, subtract, multiply, and divide.

2. A bag of wheat weighs three-quarters as much as a bag of barley that weighs 2 pounds more than a bag of wheat. How much does a sack of wheat weigh?

3. The following equation is incorrect.

5 + 5 + 5 = 550

By adding one stroke of the pen, how do you make it add up? Adding a bar across the = sign to make it "does not equal is not allowed.

5. A ten volume encyclopedia is arranged in order of the shelves of a library. The pages of each volume are 4.5 inches thick and the front and back covers are each 0.25 inches thick.

A worm born on page 1 of volume 1 munches its way horizontally through the collection in a straight line, dying of the last page of the tenth volume.

What distance will the worm have traveled during its lifetime?

4. A dartboard is divided into areas where you can score different numbers of points: these scores are 5, 12, 17, 28, 35 and 41 points.

How can you score exactly 87 points by throwing only 4 darts at the board?