The have to have same denominator .
so 2(7/15)+3(3/10)
14/30+9/30
The answer is 23/30
[tex] \frac{7}{15} + \frac{3}{10} = \frac{70}{150} + \frac{45}{150} = \frac{115}{150} = \frac{23}{30} [/tex]
:)
