Solve these division problems: (1) 20/10, (2) 50/10, (3) 70/10, (4) 90/10, (5) 200/20, (6) 120/20, (7) 140/20, (8) 180/20, (9) 150/30, (10) 180/30, (11) 240/30, (12) 270/30, (13) 210/30, (14) 360/30,

$$1. \quad 20 \div 10 = 2$$ $$2. \quad 50 \div 10 = 5$$ $$3. \quad 70 \div 10 = 7$$ $$4. \quad 90 \div 10 = 9$$

The answers are $\boxed{\textbf{2}}$, $\boxed{\textbf{5}}$, $\boxed{\textbf{7}}$, $\boxed{\textbf{9}}$.

$$5. \quad 200 \div 20 = 10$$ $$6. \quad 120 \div 20 = 6$$ $$7. \quad 140 \div 20 = 7$$ $$8. \quad 180 \div 20 = 9$$

The answers are $\boxed{\textbf{10}}$, $\boxed{\textbf{6}}$, $\boxed{\textbf{7}}$, $\boxed{\textbf{9}}$.

$$9. \quad 150 \div 30 = 5$$ $$10. \quad 180 \div 30 = 6$$ $$11. \quad 240 \div 30 = 8$$ $$12. \quad 270 \div 30 = 9$$ $$13. \quad 210 \div 30 = 7$$ $$14. \quad 360 \div 30 = 12$$ $$15. \quad 540 \div 30 = 18$$ $$16. \quad 750 \div 30 = 25$$

The answers are $\boxed{\textbf{5}}$, $\boxed{\textbf{6}}$, $\boxed{\textbf{8}}$, $\boxed{\textbf{9}}$, $\boxed{\textbf{7}}$, $\boxed{\textbf{12}}$, $\boxed{\textbf{18}}$, $\boxed{\textbf{25}}$.

$$17. \quad 160 \div 40 = 4$$ $$18. \quad 200 \div 40 = 5$$ $$19. \quad 280 \div 40 = 7$$ $$20. \quad 320 \div 40 = 8$$ $$21. \quad 480 \div 40 = 12$$ $$22. \quad 520 \div 40 = 13$$ $$23. \quad 560 \div 40 = 14$$ $$24. \quad 640 \div 40 = 16$$

The answers are $\boxed{\textbf{4}}$, $\boxed{\textbf{5}}$, $\boxed{\textbf{7}}$, $\boxed{\textbf{8}}$, $\boxed{\textbf{12}}$, $\boxed{\textbf{13}}$, $\boxed{\textbf{14}}$, $\boxed{\textbf{16}}$.

$$25. \quad 150 \div 50 = 3$$ $$26. \quad 250 \div 50 = 5$$ $$27. \quad 300 \div 50 = 6$$ $$28. \quad 350 \div 50 = 7$$ $$29. \quad 400 \div 50 = 8$$ $$30. \quad 550 \div 50 = 11$$ $$31. \quad 750 \div 50 = 15$$ $$32. \quad 800 \div 50 = 16$$

The answers are $\boxed{\textbf{3}}$, $\boxed{\textbf{5}}$, $\boxed{\textbf{6}}$, $\boxed{\textbf{7}}$, $\boxed{\textbf{8}}$, $\boxed{\textbf{11}}$, $\boxed{\textbf{15}}$, $\boxed{\textbf{16}}$.