Question

How many litres of pure acid is there in 8 litres of a 20% solution?

• A. 1.5
• B. 1.6
• C. 1.7
• D. 1.8

Answer 1

The correct option is B

1.6

Let the amount of pure acid be $x$ litres.
Total solution = 8 litres
Quantity of pure acid = 20% of the solution
So, $\frac{x}{8}=\frac{20}{100}$
$x=\frac{20}{100}\times 8$
$x=\frac{1}{5}\times 8$
$x=1.6$