Question

A jar contains a mixture of two liquids A and B in the ratio 4: 1. When 10 litres of the mixture is taken out and 10 litres of liquid B is poured into the jar, the ration becomes 2 : 3.
How many litres of liquid A was contained in the jar?

• A. 14 litres
• B. 18 litres
• C. 16 litres
• D. 20 litres
• E. None of these

Answer 1

The correct option is C 16 litres

% of B in the original mix $=\frac{1}{5}\times 100=20\%$
In final mix $=\frac{3}{5}\times 100=60\%$

Total mix = 10+10=20 litres
so qty. of $A=\frac{20}{5}\times 4$