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
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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