This is is a proportion question we can easily set this up in ratios, just like what you did. And from there we can cross multiply to solve for x. So, x times 5 equals 5x. And 25 times 3 is 75. Now we should set them equal to each other because, we literally just crossed multiplied, so, 5x=75. And then finally we divide 5 on both sides and 75/5 is 15. So therefore x is equal to 15.
