Question

A tank contains 20 L of water. Water from the tank is poured into containers of capacity 810 L. How many containers will be needed to empty the tank this way?

Answer 1

Answer:

Let the full capacity i.e. 100% be x.

so when it's 20% empty the capacity of tank is 0.8x and when it's 20% full it's capacity is 0.2x.

And 20% empty has 24 litres more capacity than 20% full.

So the equation becomes 0.8x=0.2x+24

By solving it we get x=40.

So the capacity of tank is 40 litres