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

Problem: a and b can do a work in 5 days and 10 days respectively . a starts the work and b joins him after 2 days . in how many days can they complete the remaining work ?
2

Problem: a square with sides of 15 units each . what would be the area of the square . consider a square as a combination of two right angled triangles .
225', 'd ) 81', 'e ) 144'

Problem: in township k , 1 / 5 of the housing units are equiped with cable tv . if 1 / 10 of the housing units , including 1 / 6 of those that are equiped with cable tv , are equipped with videocassette recorders , what fraction of the housing units have neither cable tv nor videocassette recorders ?

11 / 15