Question 82

The volumes of three kinds of materials are in the ratio 3:4:7 and the weights of equal volumes of the three materials are in the ratio 5:2:6 If they are mixed to form a material of 65 kg then the weight of the 2nd material in the mixture is

Solution

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Let the volumes of the 3 be: 3v, 4v and 7v

Densities of the three are 5d, 2d and 6d 

So, the weights are 15dv + 8 dv + 42 dv = 65 dv

But that is 65 kilograms.

The second one's weight is 8 dv = 8 kgs

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