book Maths Puzzle Numerical Ability

the measure of the complement of an angle is 20 degrees less than the measure of the angle.Find the number of degrees in the angle.

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x^-1+y^-1?x^-1y Can you help me simplify? HCF IF 3240,3600 and a third number is 36 and their LCM is 2^4 x 3^5 x 5^2 x 7^2. The third muber is????????????????