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Maths Puzzle
Numerical Ability
Factor: x^3-5x^2+x+15=0
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A specialty coffee store creates a special mix of two coffees at two different prices: $6.42 and $7.28 per pound each. How many pounds of the $7.28 coffee should be mixed with 7 pounds of $6.42 coffee to sell the mixture for $7.20 per pound?
an airplane took 2 hours to fly 600km against a head wind. the return trip with the wind took 1 2/3 hours. find the speed of the plain in still air.