2:3.2÷( 1-2/5- 1/3)= 12m。
3: 6÷ (1/2-3/7) = 84 people.
4: 25× 1/5 ÷ 1/6 = 30 years (monkey)
30×1/3 ÷110 =100 years (tortoise)
5: 45 ÷ 3/7 ÷ 5/6 = 126
6: 1/6÷ 1/6 = 1m
7: 60× (5/6 ÷ 5/6) = 60 km