2x+15 = 3x-25
2x-3x = -25 -15
-x = -40
x = 40
Answer:

Step-by-step explanation:
I assume your equation to solve is

When we have a product of two factors equal to zero,

The solution is either A = 0 or B = 0.
In this case, this means that we can break the equation into two equations:

Solving the first one, we get:

For the second one, we rewrite it as:

And we see that this equation has two solutions:

Therefore, the three solutions are:

Four ratios:
light to dark: 4:12
dark to light: 12:4
black to white: 2:4
white to gray: 4:10
gray to white: 10:4
any of those work.
The ratio fo boys to girls is 12:16