For this case, we must add two own fractions (Those where the numerator is less than the denominator).
So, we have:
[tex]\frac {1} {11} + \frac {1} {15} =\\\frac {15 * 1 + 11 * 1} {11 * 15} =\\\frac {15 + 11} {165} =\\\frac {26} {165} = \\0.157575758[/tex]
Answer:
[tex]\frac {26} {165}[/tex]
