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 ??

... 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 ????

or:... 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 ????

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