A number plus 20 percent is 7.2. Find the number

A number plus 20 percent is 7.2. Find the number

Let this number be X
x+20%x=7.2
x=6
A: the number is 6

Using the solution of the equation, 30 percent of a number is equal to 20 percent of 750?

Let this number be X
30%X=750*20%
0.3X=150
X=150/0.3
X=500
This number is 500

Quarter x + two fifths = eight fifths solve the equation

1/4x+2/5=8/5
Go to the denominator (multiply by 20), get: 5x + 8 = 32
The result is: 5x = 32-8
By combining the similar items, we get: 5x = 24
If the coefficient is changed to 1, x = 24 / 5

Given that the solutions of the equation 3x + 2m = 9x + 1 and 6x + 1 + 2m + 3x are the same, then the value of M is

3x+2m=9x+1
x=(2m-1)/6
6x+1=2m+3x
x=(2m-1)/3
It is known that the solutions of the equation 3x + 2m = 9x + 1 and 6x + 1 = 2m + 3x are the same
Then (2m-1) / 6 = (2m-1) / 3
So m = 1 / 2

The equation helps me solve 3 [x + 1.8] = 9 12 [x-4.5] = 66 2.6x + x = 66 x-0.7x = 1.02
In order to strengthen the dam and resist the flood, Uncle Wang voluntarily drove to transport sacks. He transported 5 trucks in the morning and 4 trucks in the afternoon, a total of 49.5 tons of sacks. How many tons of sacks were transported by each truck on average? 2. The school bought 4 tables and 4 chairs, the total price of which was 120 yuan more than that of chairs. Each chair was 25 yuan, how much was each table? 3. The number of books in the library and cartoon books of the school was 2.5 times that of story books, There are 420 more cartoon books than story books

Equation 1, x = 1.2
2、X=10
3、18.33
4.3.4
Topic 1, 49.5 / 9 = 5.5
2. Let table x yuan, 25 × 4 + 120 = 4x, x = 55
3. Suppose the storybook is x, 2.5x-x = 420, x = 280, then there are 700 cartoon books and 280 storybooks

（X-2/7X+12）/（2/7X）=13：14

Answer: (X-2 / 7X + 12) / (2 / 7X) = 13:14, that is 13 × 2 / 7X = 14 × (X-2 / 7X + 12), that is 26 / 7X = 14x-4x + 168, that is 26 / 7X = 10x + 168, that is (26 / 7-10) x = 168, that is - 44 / 7X = 168, that is x = 284 / 11

1/x-2=7x/（x-2） -3

Multiply X-2 on both sides
1=7x-3(x-2)
1=7x-3x+6
3x=-5
x=-5/3
The fractional equation needs to be tested
The test shows that x = - 5 / 3 is the solution of the equation

(x-3): (3 / 7X + 30) = 3:2 for X

(x-3):(3/7x+30)=3:2
2(x-3)=3(3/7x+30)
2x-6=9/7x+90
2x-9/7x=90+6
5/7x=96
x=96÷5/7
x=134.4

It takes 40 days for a project to be completed by team a alone. If team B does it for 10 days first, then the remaining two teams will cooperate for 20 days. 1. The number of days required for team B to complete the project alone. 2. The number of days required for the two teams to complete the project together

1. Let B complete 1 / X in X days, then B completes 1 / X in one day, a completes 20 days, a completes 1 / 40 in one day, so a completes 20 / 40, B completes 20 + 10 = 30 days, and completes 30 / x, so 20 / 40 + 30 / X = 130 / x = 1-20 / 40 = 1 / 2x = 30 (1 / 2) = 60 A: B completes 60 days alone 2, a cooperates in y days, a completes 1 / 40 in one day, B completes 1 / 2 in one day

3/7X-2=2/5(X-2)

X=42
X1 = (- 139 + 10921 under radical) / 140
X2 = (- 139-10921 under radical) / 140