Q. Varun takes a certain number of rotis during lunch, but always wastes half a roti. Rosa takes half the number of rotis as Varun, and always finishes her share. After 20 days, if the number of rotis that were consumed during lunch by them together is 120 (excluding the rotis wasted), then find the number of rotis per meal that Varun and Rosa take. How many rotis were wasted in 20 days?

Note: The number of rotis wasted, would have fed Rosa lunch for 12 days! Avoid wasting food and share your with others.