book Maths Puzzle Numerical Ability

how do u solve 5xy times 21
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14 10x(x to the third power)

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book Other Question

an automobile averaged 45 miles per hour for the first part of a trip and 50 miles per hour for the second part. If the entire trip took 4 hours and covered 195 miles for how long If 48 square inches are subtracted from the area of a square table, the result would be equal to twice the perimeter. What is the length of the side of the table?
______ feet long
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