A container has 40 l of milk. From this, 4 l of milk is taken out and replaced with water. Now 4 l of mixture is taken out and replaced with water again. Find how much quantity of milk is remaining in the container?

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Solution

Actually the question is saying to take out $\frac{1}{10} t h$ of solution during each process .
So According to question ,Quantity of milk remainng= $40 \times \frac{36}{40}$ $\times \frac{36}{40}$ $= 32.4 L$

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A container has 40 l of milk. From this, 4 l of milk is taken out and replaced with water. Now 4 l of mixture is taken out and replaced with water again. Find how much quantity of milk is remaining in the container?

Actually the question is saying to take out 110th of solution during each process .So According to question ,Quantity of milk remainng= 40×3640 ×3640=32.4L

Actually the question is saying to take out $\frac{1}{10} t h$ of solution during each process .
So According to question ,Quantity of milk remainng= $40 \times \frac{36}{40}$ $\times \frac{36}{40}$ $= 32.4 L$