exam Maths Puzzle Numerical Ability

This one has me in a spin.

Simplify:
4m/5n^2-n/2m

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exam Other Question

Chemist must mix 30 % insecticide soln with 50% insecticide soln. (same insecticide) to obtain 200 L of a 42 % insecticide soln. Please help with 2 stage linear system of equation and demonstrate resolution. THX The sum of two numbers is 94. The second is 6 more than 3 times the first. What are the two numbers?