Latest TCS Aptitude Question SOLUTION: two alloys contain zinc and copper in the ratio of 2:1 and 4:1. in what ratio the two alloys should be added together to get as new alloy having zinc and copper in the ratio of 3:1

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two alloys contain zinc and copper in the ratio of 2:1 and 4:1. in what ratio the two alloys should be added together to get as new alloy having zinc and copper in the ratio of 3:1?

Asked In TCS ratna (11 years ago)

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Pallavi Barjatiya  (11 years ago)

friends ques posted by ratna. . are not the qs. asked in tcs. do not waste ur tym wid those :)

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divyakar awasthi  (11 years ago)

two alloys should be added in the ratio of 3:5
let total weight is 30 gm.
in alloy1: zinc=20 cu=10
alloy2: zinc=24 cu=6
if we mix 30% of alloy1 & 50 % of alloy2 we will get new alloy containing zinc=18 & cu=6 which gives required ratio 3:5 of two alloys

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Pratiksha Agarwal  (11 years ago)

both alloy should be added in 10:17 ratio

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Madhusmita pradhan  (8 years ago)

first take the lcm of (2+1)=3 and (4+1)=5 , which is 15.
in 1st alloy zinc=(15/3)*2=10 and copper=(15/3)*1=5
similarly in 2nd zinc=12 and copper=3
now let take x from 1st and y from 2nd.
according to question
{(x/15)*10+(y/15)*12}/{(x/15)*5+(y/15)*3}=3/1
(10x+12y)/(5x+3y)=3/1
10x+12y=15x+9y
5x=3y
x/y=3/5
ans-3/5

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  (5 years ago)

Let the ratio in which they are mixed is x:y
then,
[(2/3)x+(4/5)y]/[(1/3)x+(1/5)y]=3/1
or, 10x+15y=15x+9y
or, 6y=5x
0r x/y=6/5
Hence the ratio is 6:5

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