A buttler stole wine from shop containing 50% spirit, then he replenished it by different wine containing 20% spirit. Thus there was only 30% spirit in the new mixture. How much of the original wine did he steal?

\(\frac{3}{5}\) \(\frac{1}{3}\) \(\frac{2}{3}\) \(\frac{1}{7}\)

\(\frac{2}{3}\)