This is simply a question of adding fractions:
(2/5) + (1/6) = (2/5) * (6/6) + (1/6) * (5/5) = 12/30 + 5/30 = 17/30
There are other ways to get to a common denominator and you should know how to do that, i.e. you should know why I chose to multiply one fraction by (6/6) and the other by (5/5). If you do not know how to do that, you may send me a message for further explanation.