A, B two people to the bookstore to buy books, a total of 108 yuan, a used his own money 3 4. B used 80% of his own money, and the amount of money left by the two was exactly the same. How much money did they take with them?

4 + 5 = 9,
108×4
9 = 48 yuan;
108×5
9 = 60 yuan;
A: a originally with 48 yuan, B with 60 yuan

A and B went to the bookstore to buy books, with a total of 54 yuan. A used 3 / 5 of his own money, B used 3 / 4 of his own money, and C used 2 / 3 of his own money to buy a book The three asked the price of the book

A uses 3 / 5 of his own money, B uses 3 / 4 of his own money, and C uses 2 / 3 of his own money to buy a pen with the same price
So the ratio of money to money is inversely proportional
5/3:4/3:3/2=10:8:9
A, B and C have 54 yuan in total
Pro rata distribution
A 54 × (10 + 8 + 9) × 10 = 20 yuan
The book is 20 × 3 / 5 = 12 yuan

After selling one-third of the books, the bookstore bought another 700 copies. This is a quarter more than the original books, and the original several books

1/3+1/4=7/12
700/(7/12)=1200

After one third of the books sold in the bookstore, 700 new books were purchased. At this time, the number of books was one fourth more than that of the original books. How many books did the bookstore have?

1200 copies 2 / 3x + 700 = 5 / 4x

Six bookstores sold 1600 books in the first quarter, three fifths less than in the second quarter

Second quarter sales
1600 ^ (1-3 of 5) = 4000 (Ben)
less
4000-1600 = 2400 (copies)

A bookstore bought three-quarters of the science and technology books and bought 200. Now the number is two-thirds of the original. How many books are there in the bookstore?

x-3/4x+200=2/3x
1/4x+200 =2/3x
1/4x-2/3x =-200
-5/12x=-200
x =480

Both a and B bought the same book in the bookstore. After reading the price of the book, they found that a was still short of 5 yuan, while B was still short of 6.2 yuan. The sum of their money was more than 1.8 yuan for a book. How much is the book?

5+6.2-1.8=9.40

A bookstore bought back two kinds of books with the same price, among which the books of category a accounted for 3 5. 78% of the price should be paid to the wholesaler; 82% of the price should be paid to the wholesaler for B-type books?

Three
5×78%=46.8%；
（1-3
5）×82%
=2
5×82%，
=32.8%．
（1-32.8%-46.8%）÷（46.8%+32.8%）
=20.4%÷79.6%，
=25.6%．
A: the percentage of profit of bookstores after selling these two kinds of books at fixed prices is 25.6%

A bookstore buys back several books with the same price as Party A and Party B, and the ratio of the number of copies of the two kinds of books is 3:5 A total of 5180 yuan. How much will be paid to the wholesalers for the two kinds of books

5180 * 3 * 40% / (3 * 40% + 5 * 50%) = 1680 yuan for purchase of category a books
5 * 50% / (3 * 40% + 5 * 50%) = 3500 yuan

There are 3400 literature and art books and science and technology books in a bookstore. When the two kinds of books sell the same number, there are still 1 / 4 and 250 science and technology books, So how many books are sold? No equations

Literary books sold 1-1 / 4 = 3 / 4
It means that 250 science and technology books are less, which is equivalent to 3 / 4 of literature and art books
Therefore, there are (3400-250) / (1 + 3 / 4) = 1800
There are 3400-1800 = 1600 scientific and technological books

A, B two people to the bookstore to buy books, a total of 108 yuan, a used his own money 3 4. B used 80% of his own money, and the amount of money left by the two was exactly the same. How much money did they take with them?