Shubha Singh's post

in Time speed, work, Alligations and mixtures problems
Updated 8 months ago

Alloy A has 80% copper and 20% tin. A certain process when applied repeatedly to the alloy decreases the copper quantity in the alloy by one-fifth and the tin quantity in it by one-tenth, each time it is applied. The minimum number of times the process must be applied so that the concentration of copper in the alloy is less than 70% is ____.

a)4

b)5

c)3

d)2

Converts - IIM Udaipur, R(PGDM and PGDHRM), R,R,T,K, MDI
2 comments
sukhoi29
@sukhoi29IIM Udaipur  ·  169 karma

The answer is 5. Approach please!

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LaddaBoy
@LaddaBoy  ·  13 karma

the thing with ratio and proportions is they r Consistent, after applying the process once the cooper would be 78%,  i.e 2% drop... assuming 2.5 as an average we have to apply the process at least 5 times to get it less that 70%..

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