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9 litres out of 90 litres milk are replaced with an equal quantity of water. Again 9 litres of the resultant milk water solution are replaced with an equal quantity of water. Find the final concentration (in Percentage) of milk in the solution after the second iteration.

32 litres of milk and water solution contains 84% milk. How much water(in litres) should be added to this solution to reduce its concentration to 64%?

Reasoning seat arrangement questions short term please any referring books

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plz add the EPFO SAA exam mock test

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find units digit of number 3^5^7^9 +1
and of number 2^3^4^5
pls explain how to find units digit if number is raised to power...which is again raised to some number