exam Maths Puzzle Numerical Ability

Is it possible to have 4 or 5 varables in algebra? if so how far can you go?

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exam Other Question

3 laps is 5/8 of a mile. If he runs 3 miles, how many laps does he need to run? The sum of three consecutive integers are arranged such that twice the middle integer is equal to 9 more than the largest. What is the sum of the three integers?