book Maths Puzzle Numerical Ability

2x^2y-5xy^2+2
-x^2y+2xy^2+2
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book Other Question

solve the equation below for y in terms of x
4x+3y=15 Flying against the jetstream, a jet travels 6390 km in 9 hours. Flying with the jetstream, the same jet travels 5150 km in 5 hours. What is the speed of the jet in still air, and what is the speed of the jetstream?