There were some containers of quantity 1,3,4,5,6,12,15,22,24,38 liters.

Q: There were some containers of quantity 1,3,4,5,6,12,15,22,24,38 liters.Each was filled with some liquid except one.The liquids are milk, water and oil.Quantity of each was like this
water = 2* milk
and oil = 2* water
find out which container was empty ?
A) 7 liter
B) 5 liter
C) 4 liter
D) 12 liter

Answer: C

1 + 3 + 4 + 5 + 6 + 12 + 15 + 22 + 24 + 38 = 130
if milk is 1, water is 2 and oil is  4 with  total 7
if milk is 2, water is 4 and oil is  8 with total 14
if milk is 3, water is 6 and oil is 12 with total 21
               .                                                       .
               .                                                       .
               .                                                       .
if milk is n, water is n*2 and oil is n*4 with total n*7
This means the total of all liquids is always like n * 7

130 divided by 7 is 18 with 4 liters left out

milk = 18 liter 
water =2*milk=2*18= 36 liter
oil    =2*water=2*36= 72 liter 
and 4 liters left out. 
Container of 4 liter was empty