One says, "Give me a hundred, friend! I shall then become twice as rich as you". The other replies, "If you give me ten, I shall be six times as rich as you". Tell me what is the amount of their (respective) capital? [From the Bijaganita of Bhaskara II) [ Hint: x + 100 = 2 (y - 100) , y + 10 = 6 ( x - 10 ) ]