Question

The sum of weights of an iron and of a copper piece is 1280 grams.The volume of a copper piece is twice that of iron piece.If weight of 1 cubic centimeter of iron is 7.8grams and that of copper is 8.9grams.Find the volume of each?

Answer 1

mass of iron=mi=vixdi where v&d are vol and density 
mass of copper=mc=vcxdc 
mi+mc=1280 gms and vc=2xvi 
vixdi+vcxdc=1280 
vixdi+2vixdc=1280, now,di=7.8/cc & dc=8.9 
putting the values we get, 
vix7.8+2xvix8.9=1280 
vix7.8+17.8vi=1280 
25.6vi=1280 , therefore,vi=50cc,thus vol of copper=vc=2vi=100cc

Hope This Helps :)

Answer 2

Answer:

Step-by-step explanation:

The sum of weights of an iron and of a copper piece is 1280 grams.The volume of a copper piece is twice that of iron piece.If weight of 1 cubic centimeter of iron is 7.8grams and that of copper is 8.9grams.Find the volume of each?