Body: Some children were riding on the bus. At the bus stop 2 more children got on the bus. Then there were 41 children altogether on the bus.
Question: How many children were riding on the bus before the bus stop?
question_concat: Some children were riding on the bus. At the bus stop 2 more children got on the bus. Then there were 41 children altogether on the bus. How many children were riding on the bus before the bus stop?