Xiao Li read 20 more extra-curricular books than Xiao Ming. Xiao Ming read one third of Xiao Li's extra-curricular books. How many pages did Xiao Li and Xiao Ming read?

Xiao Li read 20 more extra-curricular books than Xiao Ming. Xiao Ming read one third of Xiao Li's extra-curricular books. How many pages did Xiao Li and Xiao Ming read?

Using the equation?
Xiaoming looked at page X
3x=x+20
The solution is x = 10
Xiaoming read 10 pages and Xiaoli read 3 × 10 = 30 pages
Answer

[bonus] Xiaohong, Xiaoli and Xiaolan spent 23.75 yuan in the supermarket, 11.28 yuan in Xiaoli and 13.15 yuan in Xiaohong and Xiaolan, respectively
Xiaohong, Xiaoli and Xiaolan spent 23.75 yuan to the supermarket, Xiaoli and Xiaolan spent 11.28 yuan and Xiaohong and Xiaolan spent 13.15 yuan. How much did they each spend
An object falls from a high altitude and lands after 7 seconds. It falls 4.9 meters every second. After that, it falls 9.8 meters more than this one every time. How many meters is the object from the ground when it falls
When Chen Li is doing addition, she regards 9 on the addend as 4 and 1 on the percentile of the other addend as 7. The wrong result is 17.42. Is that correct?
When doing the subtraction, the pony regarded the 3 on the percentile of the subtracted number as 8 and the 7 on the tenth of the subtracted number as 2. The wrong result is 1.87. Is it correct?

1. 11.28 + 13.15-23.75 is xiaolanhua's money. If xiaolanhua's money is known, then the other two can ask for it
2、（7-1）*（4.9+9.8）+4.9
3、22.31
4. The last question is a little confused
I am also a pupil

The ratio of storybooks is 4:3. Xiaohong bought eight more and Xiaoli bought five. Now the ratio of storybooks is 7:5. It turns out that each of them has his own

Let Xiaohong have 4x and Xiaoli have 3x
8+4X 7
______ = _
5+3X 5
X=5
4X=20 ,3X=15
A: Xiaohong originally has 20. Xiaoli has 15

A and B solve the system of equations ax + 5Y = 13 4x by = - 2. The solution of the system of equations is x = - 3 y = - 1 because they read a in equation ① wrong
B misread B in equation 2, and the solution of the system of equations is x = 5
y=4
If AB is calculated correctly, try to find the solution of the original equation

First of all, according to the fact that a misread equation 1, then we know that a did not misread equation 2, so the solution of a still satisfies equation 24 * (- 3) - B * (- 1) = - 2-12 + B = - 2b = 10. Similarly, B misread equation 2 and did not misread equation 1, so the solution of B still satisfies equation 1, so 5A + 5 * 4 = 135a + 20 = 135a = - 7a = - 7 / 5