Correct Answer - Option 2 :
20 liters
Given:
Three containers contain 420, 520 and 720 liters of liquid respectively.
Calculation:
We need to calculate the HCF of liquid present in containers.
∴ Highest common factor of 420, 520 and 720 = 20
So, we need 20 liters capacity container to measure the liquid present in all three containers.