A container contains 40 litres of milk. From this container 4 litres of milk was taken out and replaced by water. This process was repeated further two times. How much milk is now contained by the container?

Sure, let's solve this step by step:

Step 1: The container initially contains 40 litres of milk.

Step 2: 4 litres of milk is taken out and replaced by water. So, the amount of milk left in the container is 40 - 4 = 36 litres.

Step 3: The process is repeated, so now the amount of milk left is 36 litres * (36/40) = 32.4 litres.

Step 4: The process is repeated one more time, so the final amount of milk left is 32.4 litres * (36/40) = 29.16 litres.

So, the container now contains approximately 29.16 litres of milk.

Sure, let's solve this step by step:

Step 1: Initially, the container has 40 litres of milk.

Step 2: After the first operation, 4 litres of milk are taken out, leaving 36 litres of milk. The container is then filled up with 4 litres of water.

Step 3: Now, the milk to total mixture ratio is 36/40. When 4 litres are taken out again, this ratio applies to the 4 litres as well. So, 4 * (36/40) = 3.6 litres of milk are taken out and 0.4 litres of water. This leaves 36 - 3.6 = 32.4 litres of milk and the container is filled up with 4 litres of water again.

Step 4: Now, the milk to total mixture ratio is 32.4/40. When 4 litres are taken out again, this ratio applies to the 4 litres as well. So, 4 * (32.4/40) = 3.24 litres of milk are taken out and 0.76 litres of water. This leaves 32.4 - 3.24 = 29.16 litres of milk.

So, after the process is repeated three times, the container now contains 29.16 litres of milk.