In a mixture there is 15% of salt. When 30 liter of water is evaporated, salt becomes 20% of mixture. Find the initial quantity of mixture.
A. 120 liters
B. 110 liters
C. 125 liters
D. 115 liters
Answer: Option A
Solution(By Examveda Team)
Let Mixture was X initially Initial Salt = 15% of X = 0.15X Initial Water = 85% of X = 0.85X 30 liters of water evaporated So, Final water = (0.85X - 30) Now, salt rises to 20% of the mixture, it means as water dried up salt rises Now, Total Mixture = (0.85X -30 + 0.15X) Final salt = 20% of(0.85X - 30 + 0.15X) As, Initial Amount of salt = Final amount of salt, we have 0.15X = 20% of(0.85X - 30 + 0.15X) 0.15X = 0.20X - 6 Or, 0.5X = 6 Thus, X = 120 Initial amount of the mixture was 120 litersJoin The Discussion
Comments ( 2 )
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x*15% = (x-30)*20%
=> x= 120 lit.
15%=3/20
20%=1/5
Water salt
20 3
5 1
But salt concentration will be same
20 3
5 1*3
Therefore
20 3
15 3
5l of water vapourises.But A/Q 30lit
Therefore 5l=30
1l=6
20l=20*6=120 (As 20 lit was the initial quantity)