The task is to generate the correct answer for a given math problem.

Problem: if a man lost 4 % by selling oranges at the rate of 72 a rupee at how many a rupee must he sell them to gain 44 % ?
48

Problem: by selling an article for $ 225 a person gains $ 75 . what is the gain % ?
50 %

Problem: two bullet train s 140 m and 210 m long run at the speed of 60 km / hr and 40 km / hr respectively in opposite directions on parallel tracks . the time ( in seconds ) which they take to cross each other , is :
12.6 sec .