Question

an alloy contains copper, zinc and nickel in the ratio 11:19:20 if the total weight of alloy is 50 kg find the percentage of each metal in the alloy

Answer 1

An alloy contains copper, zinc and nickel in the ratio of 5 : 3 : 2. The quantity of nickel in kg that must be added to 100 kg of this alloy to have the new ratio 5 : 3 : 3 is?

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6 ANSWERS



Rosna, B tech EEE Science (2016)

Answered Sep 13, 2017

Cu : Zn : Ni = 5 : 3 : 2

50kg Cu, 30 kg Zn and 20 kg Ni

New ratio 5:3:3

Clearly Zn and Ni are of same quantity

So 10kg of Ni must be added

1k Views · Answer requested by Gaurav Jain

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Ashish Singh, worked at Infosys

Answered Jul 14, 2015 · Author has 364 answers and 802.6k answer views

let you add x kg of nickel

now you have 50 kg of Cu , 30kg of Zn and 20+x kg of Ni

now 50:30 : (20+x )  =  5:3:3

so 30:(20+x) = 3:3
20+x = 30
x = 10;


so you should add 10 kg of Ni

2.6k Views · View Upvoters

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Adithya Mitter, studied at Singapore Management University

Answered Jul 14, 2015

10kg! Currently there is 50 kg copper, 30 kg zinc and 20 kg nickel=100 kg of the alloy. By adding 10 kg nickel, the alloy weighs 110 kg now, with a ratio of 5:3:3(50 kg copper,30kg zinc and 30 kg nickel)

488 Views · View Upvoters

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Answer 2

weight of copper = 11kg.
weight of zink = 19kg.
weight of nickel = 20kg.
Therefore , the total weight of alloy = 50kg.
then, 11+19+20 = 50kg
percentage of copper in alloy =
$\frac{11}{50} \times 100$
= 11×2 = 22%
percentage of zinc in alloy =
$\frac{19}{50} \times 100$
19 ×2 = 38%
percentage of nickel in alloy =
$\frac{20}{50} \times 100$
20 × 2 = 40%