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.

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?

5. A group of 100 student athletes take part in a test to see if certain vitamins improve performance. Vitamin A is given to 65 students. Vitamin B is given to 75 students. In talking among themselves, they learn that 50 students are getting both vitamins A and B. How many are not getting vitamins?