BrainDen.com - Brain Teasers

Members

2207

74

1. ## I bake

You understood it correctly. You have one of the numbers but there are actually more that meet the requirements. I just want the lowest answers.
2. ## Cross Cornering

I do see that, which is why we must keep L and W arbitrary
3. ## I bake

Everyday I make the same number of cookies. On Monday, five people came over for cookies. I gave each of them the same amount and kept one for me. The next day, I baked the same amount but this time eleven people came over. I gave them all an equal share and kept one for me. On the third day, I baked the same amount of cookies as the other days, gave thirty-five people the same amount, and of course kept one for me. What are the three possible lowest amounts of batches I made each day?
4. ## Cross Cornering

Not anywhere otherwise there is no way someone would confuse the shape for a rectangle as it would lose its fourth side and by symmetry much of that circle is immaterial.
5. ## Balancing Gold Coins

If the bag contains coins that equal 2^m then it would take m+1 try to find the fake coin. The spoiler option seems to have disappeared from the mobile app.
6. ## Alphabetize my Dvd's

I like the solution of 7, could you explain why it isn't?
7. ## Did you get more than me? pt. 2

Four men (A, B, C, and D) are kept in a room a punishment for their crimes. Each day, they retreat to a corner where they are fed an amount of a certain type of food. In total, they receive thirteen pieces of the assigned food. On this day, they all retreated to their corners to receive beef jerky. After enjoying their food, they came back to the center. In front of the group, A asked B, "Did you get more than me?" To which B replied, I don't know. Curious then, B turned to C and said, "Did you get more than me?" To which C replied, I don't know. Even more curious, C turned to D and said, "Did you get more than me?" To which D replied, "Yes and I know how much each of you got!" How much food did A and D get?
8. ## Did you get more than me?

Because then we wouldn't have a puzzle.
9. ## Cross Cornering

You understand the problem well and yes you only have a ruler. As for the equation, moving the corner of one of the rectangular corners specifically the one opposite of the 90 angle, would adjust the angles adjacent to the 90 degree angle relative to L, W L2, W2. There is an equation that we can create so that we can check to ensure that l=l2 and w=W2 with the assumption that there is a 90 degree angle between L and W.
10. ## Cross Cornering

Let's say I attempted to draw a rectangle with dimensions of L x W. When I compared the diagonals, I noticed that they were off by 6 cm. Create an equation so that I can determine how far and where I should move one of the corners to fix my rectangle.
11. ## Did you get more than me?

Four men (A, B, C, and D) are kept in a room a punishment for their crimes. Each day, they retreat to a corner where they are fed an amount of a certain type of food. In total, they receive thirteen pieces of the assigned food. On this day, they all retreated to their corners to receive beef jerky. After enjoying their food, they came back to the center. In front of the group, A asked B, "Did you get more than me?" To which B replied, No. Curious then, B turned to C and said, "Did you get more than me?" To which C replied, No. Even more curious, C turned to D and said, "Did you get more than me?" To which D replied, "Yes and I know how much each of you got!" How much food did B and C get?
12. ## Consider an ideal arse

Which ever one gives me a bigger butt
13. ## A bug problem

by explicit, I was referring to a function that for any mth generation you can generate the h, s, and n without the need to recursively derive the list.
14. ## Interview Puzzle- "Fox in a hole"

The second half of the solution seems to be inefficient though. Once we stop at hole 4 and conclude that the fox is in fact at an even hole the only hole left is hole number 2 which means that we don't need to start all over. Simply inspecting three and then two would be enough to find the fox.
15. ## exponential help

not without assuming something about the population.
16. ## A bug problem

For a particular bug population, a bug is either classified as happy, sad, or neutral. For each generation, all happy bugs birth 1 sad and 1 neutral bug. all sad bugs birth 2 happy bugs all neutral bugs birth one happy bug and one sad bug all birthing bugs die after birthing. No bug lives more than one generation and birth at the same time. These bugs do not require mating to reproduce. The initial generation only consists of one happy bug. Write an explicit function to determine for the nth generation how many happy bugs there are.

Player A has one more coin than player B. Both players throw all of their coins simultaneously and observe the number that come up heads. Assuming all the coins are fair, what is the probability that A obtains more heads than B?
18. ## Prove or disprove 0.0000.....001 equals 0

One of my students used this as their proof, I am curious about what you think of it bonanova, Assume that 0.000....1 exists then 1 - 0.000....1 = 0.999.... Since we can show 0.99999 = 1 and 0.000...1 + 0.999... = 1 then 0.000...1 must equal zero as 0+1=1.
19. ## Prove or disprove 0.0000.....001 equals 0

Prove or disprove that 0.000....000001 equals 0
20. ## Probability of missing the circle

Since nobody was brave enough to attack my 'bum' question, here is one that sounds more 'mathy'... Suppose you have a box with a square base area of 16 square inches. There is a circle drawn inside the base which shares the same center point. The diameter of this circle is 2 inches. Lastly, assume that you have a line segment with length of 1 inch which will randomly appear within the base of the box. What is the probability that this line segment will not intersect the circle?
21. ## Consider an ideal arse

http://www.scienceofrelationships.com/home/2013/11/11/curves-ahead-the-science-of-female-waist-to-hip-ratio-and-at.html You Can Assume that One Standard Sheet Of Toliet Paper Will Be Enough.
22. ## Consider an ideal arse

Let's define an ideal arse as having a 0.7 hip to waist ratio. Given this ratio and the shape of one's behind describe the best course one should take when wiping themselves after using the restroom.

24. ## Area of a rhombus or kite

Suppose we have a ten inch line segment. Draw two isosceles triangles with legs of 3inches such that each begin at the end of the line and their hypotenuse is opposite of the base line. Extend the hypotenuse lines such that they cross above the middle of the line segment. Draw a line from the height of each triangle to the bottom end of the other triangle (the acute angle). At the top a four-sided shape is formed. What is the area of this shape? Solve it without calculus.
25. ## Probability of finding a three.

your last comment was actually the inspiration of this question.
×

• #### Activity

• Riddles
×
• Create New...