# Question #ab848

$\textcolor{b l u e}{\text{Given you a starting point}}$
Let the unknown amount of 25% mix be $x$. Then we have:
$\left[\frac{60}{100} \times 3 \text{ litres"]+ [25/100xx x" litres}\right] = \left(3 + x\right) \times \frac{40}{100}$