book Maths Puzzle Numerical Ability

How much of a 10% saline solution should be mixed with a 20% saline solution to obtain 1000 mililiters of a 12% saline solution? Please explain each step simply.

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book Other Question

What is the sum of all consecutive odd integers between 1 and 5000? I am having problems setting up this problem. The sum of the digits in a two digit number is 8. When the digits are reversed, the new number is 8 less than the original number. What is the original number?