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Sagot :
Answer:
1) 150 kg
2) 97.5 kg
3) 5%
Step-by-step explanation:
Ratios of each metal to total mass of metal can be computed by dividing its corresponding value by the sum of all the values in the ratio
The ratio of zinc to metal = 6/(13 + 6 + 1) = 6/20 = 3/10
Let the total mass of the metal be X
Then mass of zinc = (3/5)X = 90 kg (given)
1) Multiplying both sides by 5/3 gives X = 5/3 x 90 = 150 kg which is the total mass of metal
2) Ratio of copper to metal mass = 13/20
Mass of copper = 13/20 x 150 = 97.5 kg
3) Mass of lead as a ratio of metal = 1/20 = 0.05
As percentage, multiply by 100 to get 0.05 x 100 = 5%
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