book Maths Puzzle Numerical Ability

the sum of the digits of a 2 digit number is 9. if the number is doubled than decreased by by 36, the answer is the original number with the digits reversed. Find the number. You m

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Solve by using quadratice formula: 3x^2=11x+4 Please help!
2) The volume of a cylinder (think about the volume of a can) is given by V = πr2h where r is the radius of the cylinder and h is the height of the cylinder. Sup