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⊙).