NCHMCT JEE 2021 Question Paper with solutions for online practice

Question : 77 of 200

Marks: +1, -0

A container contains

40 {L}

of milk from this container

4 {L}

of milk was taken out and replaced by water. This process was repeated further two times. How much milk is now contained in the container?

Solution:

Amount of milk left after 3 operations

=[40(1-\;{4}/{10})^{3}] {L}

=(40 × \;{9}/{10} × \;{9}/{10} × \;{9}/{10})=29.16 {L}

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