The number of boys in a bus at the starting point is twice the number of girls. On the way, when 15 boys got down and 10 girls entered the bus, the number of boys and girls became equal. How many boys were there at the start of the journey?

Show answer & explanation

Answer: (C) 50

Explanation

Let girls = g and boys = 2g. After the stop, 2g − 15 = g + 10, so g = 25. There were 50 boys at the start.