A metal is made from copper,zinc, and lead in the ratio 13:6:1.The mass of zinc is 90kg. Calculate the mass of the metal

2 answers

copper : zinc : lead = 13:6:1 = 13x : 6x : x
we are told that 6x = 90
then x = 15
so cooper --- 13(15) = 195 kg
zinc ----- 90 kg
lead --- 15 kg

add them up
How did you get 15 to lead
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