The boss still has one yuan there.

2.0.3+0.7 = 1 (yuan) Now, a kilo of green onions and a kilo of green onions only cost one yuan, while in the past, 1 yuan only bought one kilo.

3.3-2 = 1 (m) Climb every day 1 m, climb for four days first, and the remaining 7-4 = 3 (m) Climb this 3 m during the day, and you don't need to return it at night, because it has already arrived and needs 4+ 1 = 5 (days).

4.3- 1 = 2 100 ÷ 2+ 100 ÷ 1 = 150

5. Divide 12 into three parts, each with four parts, and weigh two of the three parts at will. If these two parts are balanced, the lighter (heavier) table tennis will be in another 1. If these two parts are not balanced, remove 1 and replace it with another 1. If it is balanced, it will be in the removed one. Divide the lighter (heavier) 1 into three parts, two 1 and two 1. Weigh two parts of 1. Balance is two parts of 1. If it is not balanced, it will be randomly removed from these two parts. If it is not balanced, it is the one that has not been taken down. Find out the different 1 ping pong balls in 12, and then use the remaining 1 1 ping pong balls to weigh any 1 ping pong balls. Heavy is light.