solution: `4A = 6B = 10C = k iff A = k/4, B = k/6 and C = k/10`. `:. A : B : C = k/4 : k/6 : k/10 = 15 : 10 : 6` `:.` C's share `= Rs. (4650 xx 6/31)` `= Rs. 900`.