Question
The cost of diamond varies directly as the square of its
weight. A diamond broke into four pieces with weights in the ratio 2 : 4 : 6 : 7. if the loss in the total value of the diamond was Rs. 140,800. The price of the original diamond was?Solution
Let the weight of the pieces of diamond be 2x, 4x, 6x, 7x Total weight of diamond = 2x + 4x + 6x + 7x = 19x Price prop; (weight)2 =gt; Price = k(weight)2 ; where, K is constant Original price = k(19x)2 Price of pieces = (4kx2 + 16kx2 + 36kx2 + 49kx2) = 105kx2 Loss in price = 361kx2 ndash; 105kx2 = 256kx2 which is given as 140,800 =gt; 256kx2 = 140800 =gt; kx2 = 550 Original price = 361kx2 = 361 x 550 = 198550
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