exam Maths Puzzle Numerical Ability

Simplify: (4m/5n^2)-n/2m.

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exam Other Question

please help me solve this problem:

12x11x10x9x8x7x6x5x4x3x2
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2^x

what is the maximum value of x so that 2^x is evenly divisible into th pr Two cars leave town going opposite directions. One car is traveling 55 mph, and the other is traveling 65 mph How long will it take before they are 180 miles apart?