1.

1). 2 : 5 : 32). 3 : 5 : 23). 1 : 5 : 64). 7 : 4 : 6

Answer»

The DENSITY of Iron is twice that of Copper and four times that of Silver.

Suppose density of Silver be D.

⇒ Density of Iron will be 4D, and that of Copper will be 2D.

Let the volumes of Iron, Copper and Silver taken be P, Q and R, respectively.

Weight = Volume × Density

⇒ Weights of Iron, Copper and Silver will be 4PD, 2QD and RD, respectively.

⇒ 4PD : 2QD : RD = 2 : 5 : 3

⇒ 4P : 2Q : R = 2 : 5 : 3

⇒ 4P : 4Q : 4R = 2 : 10 : 12

⇒ P : Q : R = 1 : 5 : 6

∴ Ratio of volumes should be 1 : 5 : 6.



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