exam Maths Puzzle Numerical Ability

5= - square root of 7y-3.

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exam Other Question

A plane which can fly 100 miles an hour in still air can fly 500 miles with a wind which is blowing at a certain rate in 5/8 of the time it would require to fly 500 miles against a wind blowing at the same rate. What was the rate of the wind? Solve by using the quadratic formula x^2 = -5x - 5