Let Ben's amount = B.
Aisha = 2B − 10
Clara = B + 20
[[model:questions/solutions/q6986.png]]
Total: (2B − 10) + B + (B + 20) = 190
• 4B + 10 = 190
• 4B = 180
• B = 45
Aisha paid = 2(45) − 10 = 90 − 10 = 80
Check: Aisha $80 + Ben $45 + Clara $65 = $190. ✓
Final Answer: $80