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Let us say the volume of the jug is V.
It is said that 20% of the 60% filled jug was removed. That means `0.2xx0.6V ` is removed. So the remaining is;
`(1-0.2)xx0.6V = 0.8xx0.6V`
This `0.8xx0.6V` is equal to 192ml.
`0.8xx0.6V = 192`
`V = 192/(0.6xx0.8)`
`V = 400`
So the volume of the jug is 400ml.
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