The cost of Coal block varies directly with the square of its weight The Coal block is divided into ...........

Quantitative Aptitude ( CCS) Ratio, Proportion

The cost of Coal block varies directly with the square of its weight. The Coal block is divided into three parts whose weights are in the ratio of 5:6:7. If the Coal block is divided into three equal parts by weight then there would be further loss of Rs.7200. Then what is the actual cost of Coal Block?

1166400

2332880

3888000

3960000

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Explanation:

Cost = (5x)²+(6x)²+(7x)² = 110x²
When weights equal = (6x)²+(6x)²+(6x)² =108x²
Loss = 7200 = 110x²-108x²=2x²
x =60
Actual cost = (6x+6x+6x)²
(18*60)² = 1166400