Shubham painted 
of the wall space in his room. Her sister Madhavi helped and painted 
of the wall space. How much did they paint together?
It is given in the question that,
Space of room painted by Shubham = 
of the room
Also,
Space of room painted by Madhavi = 
of the room
Hence,
Total space painted by them together = 
+ 
= 
= 
= 1 complete wall
3