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How much 7% saline solution should Kent mix with 90 cc of 19% saline solution to produce a13% saline solution?

Question

How much 7% saline solution should Kent mix with 90 cc of 19% saline solution to produce a13% saline solution?

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Step 1

Calculation:

Let x be required amount of 7% saline solution mix with 90cc of 19% itself.

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Step 2

On further simpli...

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