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if an alloy is 2 parts copper,3 parts copper,3 parts lead and 4 parts in,how many kilograms of each are there in an alloy weighing 108 kg?

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Cheahjimmyviz
if you mean an alloy is 2 parts copper,3parts lead & 4 parts let say silver
then
        2 + 3 + 4 =  9parts
so     wt of copper =   2/9*108   =24
         wt of lead      = 3/9* 108 =  36
         wt ofg silver =   4/9* 108 = 48
         total wt    =   24+36+48  =   108kg