A shopkeeper combined X liters of a solution containing 10% of certain material Q, with 10 liters of another solution that contained 2% of that material Q, to produce Z liters of a solution that had 5% of Q. What is the value of X?

A shopkeeper combined X liters of a solution containing 10% of certain material Q, with 10 liters of another solution that contained 2% of that material Q, to produce Z liters of a solution that had 5% of Q. What is the value of X?

A 5 liters

B 6 liters

C 7 liters

D 8 liters

Solution

Correct Answer: Option B