Answer:
r = 8/5
Step-by-step explanation:
Step 1: Simplify
10/25 = r/4
10/25 simplifies to 2/5
5/25 = r/4
Step 2: Multiply all terms by the same value to eliminate fraction denominators
2/5 = r/4
4 × 2/5 = 4 × r/4
r/4 cancels out and becomes r
4 × 2/5 = r
4 × 2/5 = 8/5
8/5 = r
or
r = 8/5
