exam Maths Puzzle Numerical Ability

factorise 20ax-15ay-4bx-3by

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an airplane flies 1449 miles against the wind and 1539 miles with the wind in a total time of 5hours. the speed of the airplane in still air is 600mph. what is the speed of the wind ? The sum of two numbers is 112. The greater of the two is 32 less than 11 times the lesser number. Find the number?