If the weight of the statue is made up of gold, silverf, and platinum in a weight ration of 7:6:5. if the weight of the statue is 189 pounds what is the weight

Question

whats the weight of the platinum?

Answer 1

The key to this sort of problem is to realize that the ratio of the platinum mass to the total mass is given by 5:(sum), or 5:18.

 

At this point, the answer can be calculated as a fractional equality.

 

5/18 = x/189

 

cross-multiplying generates

 

18x = 945

 

and solving for x gives the answer of

 

52.5 pounds. This is reasonable, since the initial setup indicates that platinum is a bit less than a third of the total weight.