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    Question

    The cost of a piece of diamond varies with the square of

    its weight. A diamond of Rs.9720 value is cut into 3 pieces whose weights are in the ratio 4: 3: 2. Find the loss involved in the cutting.
    A 6240 Correct Answer Incorrect Answer
    B 5248 Correct Answer Incorrect Answer
    C 6020 Correct Answer Incorrect Answer
    D 4540 Correct Answer Incorrect Answer

    Solution

    Let cost = k(weight)² so, 9720 = k (4+3+2) ² 9720 = k×81 k = 9720/81 = 120-----(1) so now the new cost -  C= C1 + C2 + C3 =K(w₁) ²+k(w₂) ²+k(w₃) ² =k (16+9+4) =120×29=3480 loss =9720-3480=6240

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