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?
Answer & explanation
Correct answer: option 2
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