Answer:
The correct/valid answer is 20.
Step-by-step explanation:
Step 1: Multiply both sides by 100
y*100 = 0.25(100-y)*100
Step 2: Refine
y*100 = 25 (100-y)
Step 3: Expand 25(100-y) : 2500 - 25y
y*100 = 2500-25y
Step 4: Add 25y to both sides of the givn equation
y*100+25y = 2500-25y+25y
Step 5: Simplify the equation
125y = 2500
Step 6: Divide both sides of the equation by 125
125y/125 = 2500/125
Final step: Simplify
y=20
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