Xiao Ming read a book and has read 4/ 1 of the whole book. If he reads 15 pages again, the ratio of pages read to pages unread is 2: 3. How many pages are there in this book?

Solution: You have the wrong number. Is it 1/4? \ (o)/~

Suppose there are x pages.

(x/4+ 15)/(3x/4- 15)= 2/3

3x/4+45=6x/4-30

75=3x/4

x= 100

2:

Men's neckties are each in 20 yuan, and women's corsage is each 10 yuan. The ratio of neckties to corsage in individual shops is 3: 2, and the value of * * * is 4,000 yuan. How much does the tie and chest cost?

Suppose there is a 3x tie and a 2x corsage.

Then 3x*20+2x* 10=4000.

60x+20x=4000

80x=4000

x=50

So 150 tie cost 3000 yuan, 100 corsage 1000 yuan.

I don't know if I understand O(∩_∩)O!

If you don't understand, you can ask (⊙o⊙).