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Imagine you're on a game show, and you're given the choice of three doors: Behind one door is a million dollars, and behind the other two, nothing. You pick door #1, and the host, who knows what's behind the doors, opens another door, say #3, and it has nothing behind it. He then says to you, "Do you want to stick with your choice or switch?"

So, is it to your best advantage to stick with your original choice or switch your choice?

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There is a 4cm square swimming pool. Each corners there are trees. Can you make the square 2 times bigger by not chopping down trees?

Seungjoon

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A-B=38
A/B=??

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In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake?

Answer : 47th day - pera

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Mehrdad.                                  In a bag of small balls 1/4 are green, 1/8 are blue, 1/12 are yellow and the remaining 26 white. How many balls are blue?

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Mehrdad.                                  In a bag of small balls 1/4 are green, 1/8 are blue, 1/12 are yellow and the remaining 26 white. How many balls are blue?

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1/In a pond the amount of lily pads doubles every day. On the 50th day the pond is completely full. On which day is the pond half full?

2/if it take 5 machines to 5 toys in 5 minutes, how long will it take for 100 machines to make 100 toys?

3/Two Fathers and Two Sons Riddle

Two fathers and two sons sat down to eat eggs for breakfast. They ate exactly three eggs, each person had an egg. The riddle is for you to explain how

4/What digit is the most frequent between the numbers 1 and 1,000 (inclusive)? To solve this riddle you don't want to manually do all of the math but rather try to figure out a pattern.

5/If 9999 = 4, 8888 = 8, 1816 = 3, 1212 = 0, then 1919 =?

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Mehrdad.                                 A person jogged 10 times along the perimeter of a rectangular field at the rate of 12 kilometers per hour for 30 minutes. If field has a length that is twice its width, find the area of the field in square meters.

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Mehrdad.                                 A person jogged 10 times along the perimeter of a rectangular field at the rate of 12 kilometers per hour for 30 minutes. If field has a length that is twice its width, find the area of the field in square meters.

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Here is a list of months and a code for each
January: 7110
February: 826
March: 5313
April: 541
May: 3513
June: 4610
July: 4710
What is the code for the month of August?

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There was a circular house 🏡. While father was at work and saw his son lying dead. There were three fat cleaning ladies - one that had red hair and that cleaned the bathroom.(Fatima) One ladie cooks in da kitchen(Wendyyyy) and one cleaned the corners (elzmino). They said they didn't kill him. Find da answer which🖕Killed him?

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Pisa Math Questions