A container contains 40 litres of liquid A. To dilute this liquid, 4 litres of liquid was taken out and replaced by water. This process was repeated three times. How much amount of liquid is left in the container?

Using the formula for repeated replacement, the amount of pure liquid A left is 40 multiplied by (1 minus 4 divided by 40) cubed. This simplifies to 40 multiplied by 0.9 cubed, which equals 40 multiplied by 0.729. The final amount of liquid A left in the container is 29.16 litres.

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