A square of side length 6 inches is inscribed in a circle. What is the radius of the circle? Express your answer in simplest radical form.

*Solution to yesterday’s problem:*

We can represent this problem using a pretty simple equation:

The original solution was 500 mL of a 20% solution. This means that 20%, or 100 mL, was salt. Let’s put those in our equation:

Of course, this doesn’t work because we are *adding* 5% solution. Let’s call the amount of solution we’re adding *x*. Then our equation becomes

Solving this equation by cross-multiplying,

So you need to add *3250 mL*, or 3.25 L, of 5% solution to get a 7% solution.

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