1) 9 24/27+12 13/27 2)8-3 6/15 3)16 3/13 - 6 8/13 4)10 7/16-4 12/16 5) (20 16/25 + 13...

1) $9 \frac{24}{27} + 12 \frac{13}{27} = 22 \frac{10}{27}$
2) $8 - 3 \frac{6}{15} = 4 \frac{9}{15} = 4 \frac{3}{5}$
3) $16 \frac{3}{13} - 6 \frac{8}{13} = 9 \frac{8}{13}$
4) $10 \frac{7}{16} - 4 \frac{12}{16} = 5 \frac{11}{16}$
5) $(20 \frac{16}{25} + 13 \frac{9}{25}) - (23 \frac{4}{14} + 7 \frac{13}{14}) = 34 - 31 \frac{3}{14} = 2 \frac{11}{14}$
6)
1)15; 2) 20