book Maths Puzzle Numerical Ability

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Due to road construction delays the Swansons averaged only 36 mph on their trip to their vacation home last summer. This summer they averaged

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Solve for x

1/x-5 + 1/x-12 = 1/x-17x+60

/ indicates fraction 3 groups of people were hired to work during a special promotion campaign for a laundry detergent. The first group is twice as large as the second, and the third is as large as the