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Alligation or Mixture - General Aptitude

Q1:

A container contains 40 litres of milk. From this container 4 litres of milk was taken out and replaced by water. This process was repeated further two times. How much milk is now contained by the container?

A 26.34 litres

B 27.36 litres

C 28 litres

D 29.16 litres

ANS:D - 29.16 litres

Amount of milk left after 3 operations = 40 1 - 4 3  litres
40
   = 40 x 9 x 9 x 9 = 29.16 litres.
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