Calculation questions What is the quotient of 2133 minus 201 divided by 12?

Calculation questions What is the quotient of 2133 minus 201 divided by 12?

2133-201=1932
1932÷12=161

Mathematics six practical problems (need answers and process)
The original number of team B is three seventh of that of team A. now 30 people are sent from team a to team B, the number of team B is two-thirds of that of team A. how many people were there in team a and team B?

If team a has 7x members, team B has 3x members
（3X+30）/（7X-30）=2/3
9X+90=14X-60
5X=150
X=30
There were 210 in team a and 90 in team B

The price of a certain commodity is 10 yuan per piece. If the quantity of this commodity purchased by mail order is less than 100 pieces, each piece will be paid according to the price, and another 10% will be paid as the postage. If the quantity exceeds or reaches 100 pieces, each piece will be paid at 10% of the price, and the postage will not be paid, The total payment is 1960 yuan. It is known that the quantity is less than 100 pieces in one time and more than 100 pieces in the second time. How many pieces did you buy in two times?

1、 Suppose that 200 pieces of goods are all purchased in the second way, 200 × 10 × 90% = 1800 yuan, the number of the first purchase: (1960-1800) / [(10 + 10 × 10%) - 10 × 90%] = 80 pieces, the number of the second purchase: 200-80 = 120 pieces