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Make 24 from the numbers 1, 3, 4, and 6. You can only use basic arithmetic operations such as addition, subtraction, multiplication, and division.

Describe the classification scheme. A EF HI KLMN T VWXYZ BCD G J OPQRS U

1 11 21 1211 111221

1, 3, 5, 15, 17, 51, 53, …

Using bags with different money amounts, you want a combination of them to add up to every dollar possibility between $1 and $67, with cents not included. What is the minimum number of bags you need?

A farmer challenges an engineer, a physicist, and a mathematician to fence off the largest amount of area using the least amount of fence. The engineer made his fence in a circle and said it was the most efficient. The … Continue reading →

Insert the correct mathematical signs to make the following calculations work: 7 8 20 32 = 44 9 3 42 12 = 94.5 8 2 12 9 = 57 6 7 15 13 = 44 5 32 6 20 = … Continue reading →

If you use a certain formula on 13, you end up with 7. Under the same formula, 2352 becomes 16, 246 becomes 14, 700 turns into 16, and 1030 becomes 14. What would 9304 become?

Given 12 coins, one of which is false with a different weight. Determine in the minimum number of weighings which one is false and whether it’s lighter or heavier than the rest.