Once you attempt the question then PrepInsta explanation will be displayed.

Container contains 40 litres, initially 4 litre milk taken out from that. After that remaining quantity of milk is

40–4=36 litres

Now the container is filled with water . Total quantity is 40 litres out of 40 only 36 litres is milk. If another 4 litres is taken out from the container it is not fully milk. So we have to find quantity if milk

36/40*4=3.6 litres

In 4 litres only 3.6 is milk, now we deduct this also from the total milk quantity

36–3.6=32.4litres

Once again the process is repeated

32.4/40*4=3.24litres

Now deduct this from 32.4litres

32.4–3.24=29.16litres.

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