exam Maths Puzzle Numerical Ability

solve:

x^2-y^2=4
x+y=1

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exam Other Question

A plane can travel 400 miles against the wind in the same time that it can travel 500 miles with the wind. If the speed of wind was 10 miles per hour. Find the speed of the plane in still air. If a license plate does not contain any vowels (A, E, I, O, U) or the number 5. How many different possibilities outcomes for the license plate?