exam Maths Puzzle Numerical Ability

find the center and radius of a circle, given the following equation of the circle
x^2+y^2=100

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exam Other Question

Two cars leave City A at the same time to travel to city B. One car travels at 72 km/h and other at 78 km/h. If the slower car arrives 20 min. after the faster car, how far apart are City A and City B? Show that the volume of a right circular cone with height [h] and base radius [r] is [(1/3)pi x r^2 x h]