maths
posted by Anonymous .
An alloy is made by using copper and zinc in the ratio of 17:3 how much zinc is used to make 4kg of the alloy?

zinc = 3x kg,
copper = 17x kg,
3x + 17x = 4.0 kg,
20x = 4,
x = 4 / 20 = 0.20,
3x = 3 * 0.20 = 0.6 kg = zinc required. 
16

let weight of zinc and copper=3x and 17x respectively.
Then,
17x + 3x=4000grams
20x=4000grams
x=(4000/20)grams
x=200grams
therefore, zinc required=(200*3)grams=600 grams=0.6 kg.
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