(2) Let the number of oranges with Natu be x. Number of oranges with Buchku = y Case I, x+10=2(y−10) ⇒x+10=2y−20 ⇒2y−x=20+10=30..(i) Case II, y+10=x–10 ⇒x−y=10+10=20...(ii) On adding equations (i) and (ii), 2y–x+x–y=30+20 ⇒y=50 From equation (ii), x–50=20 ⇒x=50+20=70