<h2>225 milliliters of 5% solutions</h2><h2>and</h2><h2>75 milliliters of 25% solutions.</h2><h2 /><h2>Feel free to contact me if you have issues or difficulties.</h2>
C. You'd be starting at a higher floor (positive number) and descending floors (negative number per x). If you assume x is time it's a little more logical and visual.