An integer from \(1\) to \(25\) inclusive is chosen at random. If the probability that the integer is odd can be expressed as the reduced fraction \(\frac{a}{b},\) what is \(a+b?\)

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In a school of \(300\) students, there are \(A\) students who take a music class and \(B\) students who take art class, \(x\) students who attend both, and \(C\) students who are not enrolled in music or art. If \(A=220, B=150,\) and \(C=50,\) what is the value of \(x?\)

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