book Maths Puzzle Numerical Ability

the sum of the digits of a two-digit number is 12. if the digits are reversed, the new number is 18 less than the original number. find the original number.

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book Other Question

Luke drove half the distance of a trip at a speed of 40 mph. At what speed would he have to drive for the rest of the distance so that the average speed for the entire trip would b graph the rational function

x^2 - 4/x - 1