This type of question is easy if we know the height in the end.
Because we do not know the height, we make it 1u
40 x 20 x 1u = 800u (volume of water in Tank A, in terms of “u”)
20 x 20 x 1u = 400u (volume of water in Tank B, in terms of “u”)
800u + 400u = 1200u (total volume of water, in terms of “u”)
40 x 20 x 30 = 24000 (volume of water at first)
1200u = 24000 (total volume of water)
1u = 20 (height of water in the end)
40 x 20 x 20 = 16000 (volume of water in Tank A in the end)
Ans: 16 litres
We are using 1u to solve the above question.
Questions can varied, like height of Tank A is twice of Tank B.
Therefore, height of Tank A is 2u and Tank B is 1u.
And we can solve the question using the above concept.