If 240 lt of oil is poured into a tank, it is still 20% empty. How much more oil is to be poured to fill the tank?

60 liter

If the tank is 20% empty after poring 240 lt of oil, that means it is 80% full.

We can say 80% = 240

In order to fill the tank we need to add in 20%

So, 20% = \(\frac{ 240}{ 80}\) x 20 = 60

Therefore, we need to add 60 lt of oil to fill the tank