Add 3 / 5 to a number and subtract 1 / 6 to 13 / 15 to find the sequence equation

Add 3 / 5 to a number and subtract 1 / 6 to 13 / 15 to find the sequence equation

Let this number be X
x+3/5-1/6=13/15
X=13/15+1/6-3/5
X=13/30

How much is 62.5% of a number plus 8 equal to 4 / 3 of it

8÷（3/4-62.5％）＝8÷（6/8-5/8）＝8÷1/8＝64

Three times of a number plus two times of this number equals 15. Find the equation

Let this number be X
3X+2X=15
15X=15
X=15÷15
X=1
A: that's 1

It was originally planned to transport 840 tons of coal in 15 days, but now it will transport 4 tons more every day, which can be completed in a few days. Please use the proportion to solve the problem. The process needs to be sent

Set X days to finish
840 / 15 = 56 tons
15:x=(56+4):56
60x=840
X = 14 days

X divided by 1000000 times 100% is equal to 4%

X÷10^6*1=0.04=4X10^-2
X = 4x10 ^ 4 times the fourth power of 10
X=40000

60 divided by X and 150 equals 300

60/x=150 x=60/150=2/5
Remember to adopt it

Solving the equation X-2 of x-1-2-1 of X is equal to 3

The original formula multiplies X-2 on both sides
x-1+1=3(x-2)
x=3x-6
3x-x=6
2x=6
x=3
Click comment in the upper right corner, and then you can select satisfied, the problem has been solved perfectly

If the solutions of x-k equal to k-3x and 2x-3 equal to 1 are opposite to each other, the value of K is obtained

2x-3=1
2x=4
x=2
That is, the solution of 2x-3 = 1 is 2
So the solution of x-k = k-3x is - 2
therefore
2 / 2 (- 2) - k = K-3 * (- 2)
-1-k=k+6
-k-k=6+1
-2k=7
k=-3.5

Solve the equation 2x / 25 = 8:0.4

25/2x=20,
x=25/40=5/8=0.625

1.2x-8.4 = 0 to solve the equation

1.2x－8.4=0
1.2x－8.4=0＋8.4
1,2x－8.4=8.4
x=8.4÷1.2
x=7