exam Maths Puzzle Numerical Ability

find the center and radius of the circle given by:
x^2+10x+y^2+12y=-12

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exam Other Question

A three piece suit costs exactly $100. No more no less. It has a vest, pants and a coat. The pants cost twice as much as the vest. The coat costs twice as much as the pants. How much does each piece cost. 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.