30

• $$4 \frac{9}{20} + 3 \frac{13}{30} = 4 \frac{9 \cdot 3}{20 \cdot 3} + 3 \frac{13 \cdot 2}{30 \cdot 2} = 4 \frac{27}{60} + 3 \frac{26}{60} = (4+3) + (\frac{27}{60} + \frac{26}{60}) = 7 + \frac{53}{60} = 7 \frac{53}{60}$$.

Ответ: $$7 \frac{53}{60}$$