book Maths Puzzle Numerical Ability

a^2-9ab+81b^2

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book Other Question

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? what is the solution to z/20+1/12=z/15-1/10 and 4W+23/5=19-W/7