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

Problem: a starts business with rs . 3500 and after 8 months , b joins with a as his partner . after a year , the profit is divided in the ratio 2 : 3 . what is b â € ™ s contribution in the capital ?
15750

Problem: a train 800 m long can cross a pole in 10 sec and then find the speed of the train ?
28

Problem: in a class of 40 students 26 play football and play 20 long tennis , if 17 play above , many play neither ?

11