Hi guys! Here is a math quiz. I was carrying a stone weighing 40 kgs. As I was walking thru the road( chilpo bato,rat mato) , my feet slipped and I fell down. The stone broke into 4 pieces. To my suprise, it broke into such pieces that now with the combination of those four pieces of stone , I can weigh any integer number of kgs from 1 to 40. To elaborate, i can weigh 1, 2, 3 ... 40 kgs of rice with the combination of those stones. U guys need to find out the weights of those four stones...Mathematical proof of the answer will be truely welcomed.