Orange problem: Xiaoming went to buy oranges, and the boss said that 50 cents each, two orange peels can be exchanged for one orange. Excuse me, if Xiaoming bought oranges with 10 yuan, how many oranges did he actually get (including small change)? Answer: 39-20+10+5+2+1+1= 39.

Tree planting: Xiaoming and his classmates went to plant trees on Arbor Day. They planted 128 trees. The ratio of maple to mulberry is 16: 7, and banyan is 8 more than mulberry. How many maple, mulberry and banyan trees are there? Answer: 64, 28, 36

How about two?