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Xiaoming and Xiaogang go to the library to borrow books. Xiaoming goes once every nine days and Xiaogang goes once every six days. If they meet in the library on February 2, what day will they meet again in the library?
It's February 20
Find the least common multiple of 6 and 9 is 18
Then use February 2 plus 18 days,
Xinhua Bookstore bought 4 children's encyclopedias for the June 1 children's day. The teacher bought 5 sets at the preferential price. How much is the average price per set? 100 yuan per set.
According to the meaning of the question, buy 4 sets and give 1 set, so the teacher's 5 sets is equivalent to only using 4 sets of money
4x100 = 400 (RMB) 400 △ 5 = 80 (RMB)
Answer: average 1 set 80 yuan
Xinhua Bookstore to celebrate the "June 1" children's day, buy 4 sets of children's Encyclopedia free, each set of 45 yuan, buy 4 sets at a time, how much cheaper each set?
Nine
Xinhua bookstore has 4800 science and art books. The number of literature and art books is 60% of that of science and technology books?
Science and technology books: 4800 × (1 + 60%) = 3000
Literature and art books: 3000 × 60% = 1800
Four sets of science and technology books and two sets of literature and art books are bought from Xinhua bookstore. The total cost is 102 yuan. Each set of science and technology books is 3 yuan more expensive than literature and art books. How much is each set of science and technology books and each set of literature and art books?
If X Yuan is set for each literature and art book, it is (x + 3) yuan for each set of scientific and technological books
4*（X+3)+2*X=102
6X+12=102
X=15
X+3=15+3
=18
A: each set of science and technology books is 18 yuan, and each set of literature and art books is 15 yuan
Xinhua Bookstore returned a batch of literature and technology books, of which literature and art books accounted for 5 7, 2100 more than science and technology books. How many art and science books are returned to Xinhua bookstore?
1-5
7=2
7；
2100÷（5
7-2
7），
=2100÷3
7，
=4900 (copies);
A: Xinhua Bookstore shipped back 4900 art and science and technology books
Xinhua Bookstore sold 2688 books one day, of which science and technology books were three times as many as literature and art books, and children's books were twice as many as literature and art books To calculate
A: this problem can be solved by using the idea of equation. We can buy x books of literature and art. According to the meaning of the title, we can know that science and technology books are 3x, and children's cultural relics are 2x. According to the relationship between "science and technology books + literature and art books + children's books = books for sale today", we can get the equation - x + 2x + 3x = 2688
Xinhua bookstore has brought 3800 literary and technological books, of which 2 / 3 of them are as many as 3 / 5 of science and technology books. How many literary and technological books are there? By eight o'clock,
Science and technology book 2000, literature and Art Book 1800, I saw all 8.01
As shown in the figure, two cards with different specifications are stacked together. The area of the overlapping part is 3 / 5 of the area of the large card and 3 / 4 of the area of the small card, If the area of the non overlapping part of two cards is equal to 270 square centimeters, calculate the area of the overlapping part To process and ideas fast, fast, fast, fast
From the large card area × 35 = the small card area × 34, we can get the following results:
Large card area: small card area = 34:35 = 54,
Consider the area of large cards as five, and the area of large cards is four,
The area of the overlap is 3 parts,
So the area of the non overlapping part of the two cards is 5 + 4-3 × 2 = 3,
270 △ 3 × 3 = 270 (square centimeter);
A: the area of overlap is 270 square centimeters
There is a completely closed container. Measured from the inside, the length is 20cm, the width is 16cm, and the height is 10cm. When the container is placed horizontally, there is 7cm high ink in it. If the container is put upright, how many cm is the ink height?
20×16×7÷（16×10），
=2240÷160，
=14 (CM);
A: the height of the ink is 14 cm
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