Brain Teaser Worksheets - Free Printable

The image contains a set of brain teasers. Below, I will solve each problem step by step and explain the reasoning.

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Problem 1:

Question: If you could shave an elephant by using only one blade that has no sharp edges, how can you use the back of the blade to remove the hair?

Solution:
- The key here is to think creatively about the word "shave." Shaving typically involves removing hair, but it doesn't necessarily require cutting or scraping.
- You can use the back of the blade (which has no sharp edges) to rub the elephant's skin, which might loosen and remove some hair due to friction. This satisfies the condition of using the back of the blade without breaking the rules.

Answer: Use the back of the blade to rub the elephant's skin, loosening the hair through friction.

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Problem 2:

Question: Who made holes around and not square?

Solution:
- This riddle plays on the idea of "holes" and their shapes. The answer is someone who makes circular holes, as circles are not square.
- A common example is a drill or someone using a drill to make holes in wood or other materials.

Answer: A drill (or someone using a drill).

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Problem 3:

Question: How can you cut a cake into 8 pieces by making only 3 cuts?

Solution:
- To solve this, think about how the cuts can intersect to maximize the number of pieces.
1. Make the first two cuts perpendicular to each other on the top surface of the cake. This divides the cake into 4 pieces.
2. Make the third cut horizontally through the middle of the cake. This splits each of the 4 pieces into two, resulting in 8 pieces in total.

Answer: Make two perpendicular cuts on the top surface and one horizontal cut through the middle.

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Problem 4:

Question: Is there a 4th of July in England?

Solution:
- The 4th of July is Independence Day in the United States, celebrating the country's independence from British rule.
- Since England is part of the United Kingdom and was involved in the conflict with the American colonies, it does not celebrate the 4th of July as a national holiday.

Answer: No, there is no 4th of July in England.

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Problem 5:

Question: How many months all the year have 28 days in them?

Solution:
- Every month in the calendar has at least 28 days. Even February, which is the shortest month, has 28 days in a common year and 29 days in a leap year.
- Therefore, all 12 months of the year have at least 28 days.

Answer: All 12 months have 28 days.

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Final Answers:

1. Use the back of the blade to rub the elephant's skin.
2. A drill.
3. Make two perpendicular cuts on the top surface and one horizontal cut through the middle.
4. No.
5. 12 months.

Boxed Final Answer:
\[
\boxed{1. \text{Rub the skin}, 2. \text{Drill}, 3. \text{Two perpendicular cuts + one horizontal cut}, 4. \text{No}, 5. \text{12 months}}
\]