Suppose it's all chickens.
45 * 2 = 90 146-90 = 56 56/(4-2) = 28 ...
45-28= 17 ... Chicken
2. 10 stamp: 20 stamps 100, with a total value of 18 yuan 80 cents. How many stamps are there?
Suppose all stamps are 10.
10* 100= 1000 1880- 1000=880
880/(20- 10) = 88 ...20 stamps
100-88 =12 ...10 stamp
3. Buy a batch of books, with each class divided into 16 books and 10 books; There are 0/8 books in each class/kloc, and 6 books are missing. How many books are there altogether?
Solution: There are X books.
(X- 10)/ 16 =(X+6)/ 18
Solution: X= 138