exam Maths Puzzle Numerical Ability

Hat sizes are determined by measuring the circumference of one's head in either inches or centimeters. Use ratio and proportion to complete the following table.
Hat Size
7 1/2 r

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exam Other Question
Find all the numbers for which the rational expression is undefined:
q^3-8a/q^2-64 find 3 consecutive integers such that the square of the third exceeds the sum of the secod and the square of the first by 42