2. A bus carries 50 passengers, some of whom buy A-type tickets, each for 1 yuan, while others buy B-type tickets, each for 2 yuan. At last, the conductor calculated that the revenue from selling ticket A was more than that from selling ticket B 17 yuan. How many people bought a ticket?

(50- 17) ÷ 3× 3+ 17 = 39 people.

3.8× 2 ÷ (1-2/3 )× 2/3 = 32 (kg)