Exam Maths Puzzle Permutation and Combination

Attendance at a concert was 480. The ratio of adults to student was 5 to 3. How many adults attended? How many students attended?

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Exam Other Question

Can you please explain how do the following problem?
2x/2 + 10 = x/10 +2
what is the value of x - 1?
How do you solve this equation when trying to solve for x in terms of r?
x = 3x + 2r