Final answer:
To solve the equation (5)/(x) = (15)/(x+20) for x, cross-multiply to get 5(x + 20) = 15x. Simplify the equation to find x = 10.
Step-by-step explanation:
To solve the equation (5)/(x) = (15)/(x+20) for x, we can cross-multiply to get 5(x + 20) = 15x. Simplifying this equation gives 5x + 100 = 15x. Subtracting 5x from both sides, we have 100 = 10x. Dividing both sides by 10, we find that x = 10.