#### Answer

31/54

#### Work Step by Step

In order to add or subtract fractions, we start by making a common denominator (bottom of the fraction). Thus, we multiply 5/18 by 3/3 and 8/27 by 2/2 to obtain:
$\frac{15}{54}$+($\frac{16}{54}$)=$\frac{31}{54}$.