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The Matrix

It takes 6 minutes and 12 minutes, respectively, to run two computer programs when they are run one at a time. However, their speeds are reduced by 50% and 40%, respectively, if running in parallel. If a PC starts running the two programs together, how long will it take for them to finish?

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Car Journey

Mark’s car began a journey from a point at 7 AM, traveling at 30 mph. At 8 AM Jason’s car started traveling from the same point at 40 mph in the same direction as Jason. At what time will Jason pass Mark?

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Call It In The Air

What is the probability that a fair coin will show “heads” 2 out of 4 times?

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Best of a Series

Two teams are playing a best-of-five series, which ends as soon as either team wins three games. If the two teams are equally likely to win a game, regardless of the outcomes of the others, what is the probability that the series ends after the first three games?

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Median of Four Values

If the mean of 15, x, 17 and 12 is 15, what is the median of these four values?

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Trigonometric Identities

Which of the following expressions can be simplified such that the result is equal to 1?

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Adding Exponents

What is the value of 10-2 + 10-3 + 10-4?

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Miles of Calculations

One-hundredth of a mile equals approximately how many meters?

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Scientific Notation

2.4 x 10-6 x (5 x 106)2 = ?

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Units of Liquid

Joe has a water bottle with 106 units of liquid. He notice that his bathtub holds 102 water bottles. How many units of liquid does his bathtub hold?

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