6.700g of of alloy is made up of copper, tin and nickel in the ratio 2:3:2. How many grams of each metal are there?

copper =  2 / ( 2+3+2) * 6700 g =  1914.29 g

tin        =  3 / (2 +3+2) * 6700 g =   2871.43 g

nickel = ...........   you try it !