exam Maths Puzzle Numerical Ability

simplify. Assume variables represent nonnegative values. 3(sq rt)27k6

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exam Other Question

2x-4y=7
4x+2y=-1 Two trains leave from a station at the same time. They travel in opposite directions, one at 62 km/h, the other at 48 km/h. How long will it take before the are 550 km apart?