Answer: 3
Explanation:
1. Put it as an algebraic equation. 5x + 4x= 27
2. Solve for x. You get 3. Now plug in that value to 5x and 4x.
3. 5x (15) is the people who visited the art museum, and 4x (12) is the people who visited the science museum.
4. Now, find the difference between 15, and 12. The answer is 3