By Alligation rule: (72 - 64.5) : (64.5 - 62) = 7.5 : 2.5 = 3 : 1.
एलीगेशन (Alligation) नियम से: (72 - 64.5) : (64.5 - 62) = 7.5 : 2.5 = 3 : 1।