3 person went for dinner. When they finished eating, they kindly asked for the bill ; the total was $25. Each of them paid $10 which brings the total to $30. They received a balance of $5. Then each of them took back their respective $1 and the balance of $2 was given as tips.
So the question is, if each person paid $10 and took back $1 (which brings the amount of $9 per person paid for their meal). Now lets do the math, $9 x 3 = rm27 ; Plus $2 as tips = $29. Where did the $1 go?