A number is 14 less than 5 times of 5.4. What's the number A number is 14 less than 5 times of 5.4. What's the number After 2.4 hours, the two cars ran 360 kilometers when they met. It is known that the speed of car a is 1 / 2 of that of car B. what are the speeds of the two cars? After reading a book, Li Beichuan was able to read 5 / 14 of the whole book in one day and 4 / 7 of the whole book in the next day. He has read 48 pages more than none. How many pages are there in this book?

Let this number be x, then x + 14 = 5.4 × 5, and the solution is x = 13. A: this number is 13. Two cars travel from a and B at the same time. After 2.4 hours, the two cars run 360 kilometers when they meet

The sum of three times and four times of a certain number x is less than five times of it

3x+4=5x-6
3x-5x=-6-4
-2x=-10
x=-10/-2
x=5

The sum of a number plus 7.3 is 2 less than 10 and 1 / 6 (with equation)

Let this number be X
X + 7.3 = 10 1 / 6-2
X = 8 1 / 6-7.3
X=26/30
X=13/15

3.5 times of a number is 2 less than 6.5 times of it. What's the number? We need to make an equation. Who knows how to do it

6.5x-3.5x=2
3x=2
x=2/3

In the eighth grade of mathematics, the equations are x + y = 40, 2.4x + 2Y = 90,

x+y=40 (1)
2.4x+2y=90 (2)
(2)-(1)×2
2.4x-2x=90-80
0.4x=10
therefore
x=25
y=40-x=15

The solutions of the equations are: 1,3 x + 5 y = 3 and 2 X-5 2Y = 1,2,3 (x + y) - 4 (x + y)
Solutions to the equations
1. 3 / x + 5 / y = 3 and 2 / X-5 / 2Y = 1
2. 3 (x + y) - 4 (X-Y) = 4 and 2 / 2 (x + y) + 6 / 6 (X-Y) = 1

Glad to answer for you!
one
5x+3y=45...①
5x-4y=10...②
① The formula 7Y = 35, y = 5 is obtained
x=6
two
3x+3y-4x+4y=4,-x+7y=4...①
(3x+3y)+(x-y)=6,4x+2y=6...②
① * (- 4) gives 4x-28y = - 16... ③
② (3) we get 30y = 32, y = 16 / 15
We get x = 52 / 15
If there is no doubt, thank you very much!

The solution of the system of equations x + y = 10x-y = 2 is___ ．

X + y = 10, ① X-Y = 2, ② + ② get 2x = 12, the solution is x = 6, substituting x = 6 into ① get y = 4, so the answer is x = 6y = 4

Solve the equations x + y = 300 5% + 53% y = 35% × 300

This problem should have an X after 5%, otherwise formula 2 becomes a one variable linear equation

To solve the equations: (1) − x + 3Y = 72x = 5Y; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (2) x + y = 3005% x + 53% y = 300 × 25%

(1) By substituting − x + 3Y = 7, ① 2x = 5Y, ② to get: x = 2.5Y, substituting ① to get: - 2.5Y + 3Y = 7, that is, y = 14, substituting y = 14 to get: x = 35, then the solution of the equations is x = 35y = 14; (2) the equations are sorted out as: x + y = 300, ① 5x + 53Y = 7500, ② - ① × 5 to get: 48y = 6000, that is, y = 125, substituting y = 125 into ① to get: x = 175, then the solution of the equations is x = 125Y = 175

Fast solution of {X-Y = 30,5% x-53% y = 30 * 29% equations

x-y=30
5％x-53％y=30*29％
x-y=30
5x-53y=30*29
5x-5y=30*5
5x-53y=30*29
By subtracting the two formulas, we get (53-5) * y = 30 * (29-5)
So 48y = 30 * 24
So y = 15
So x = y + 30 = 45
Conclusion: x = 45, y = 15