Astudent raises her grade average from a 75 to a 90. what was the percent of increase

This can be solved algebraically. Before we start, as context, to find a percentage you multiply by the percentage/100.



This tells us that 90 is 120% of 75. However, your question wants us to find the increase, therefore we don't need that 100.
Therefore, the increase is 20%.

The answer is 16.64 feetyour welcome