25x is to 40y as 25y is to what?

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## Wrath of the Math

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## Book Organization

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## Normal Distribution Percentages

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## I Know Primes

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## Describe the Data

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## Intelligent Doodles

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## Population Growth

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## Effectiveness of Hand Wash

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## Bocce Ball

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## Length of the Hypotenuse

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25x is to 40y as 25y is to what?

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In how many different orders can six books be organized in a shelf?

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In the normal distribution, what percentage of scores fall within one standard deviation of the mean?

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What is the ratio of the number of composite integers to the number of prime integers in the interval [1,10]?

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Given the following data, which of the following terms best describes the data?

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A friend of yours draws a circle circumscribing a regular octagon. What is the ratio of the area of the octagon to the circle?

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Which of the following would be best to use for population growth with known upper limit?

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Bacteria such as V. cholerae are known to follow an exponential growth curve rate, and will double their number every 15 minutes. Fortunately, anti-bacterial hand wash can kill 99.9% of bacteria on a surface. If a colony of 500 V. cholerae cells are left alone for 2 hours, then anti-bacterial handwash is applied thoroughly, how many bacterial cells are left?

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There are 5 white, 7 red and 8 black balls in a box. If you are blindly picking up balls from the box, what is the minimum number of balls you need to take out of the box to ensure that you have at least 2 balls of the same color?

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If the area and perimeter of a right triangle are 30 cm^{2} and 30 cm, respectively, what is the length of the hypotenuse (the side opposite the right angle)?

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