So far Andrea and her partner have completed 75% of the 12-page essay, that means they still have to complete 25%.
What you have to do is find 25% of 12
The first thing you should do is turn 25% into a decimal and then multiply it by 12 and the final answer should equal the number of pages that Andrea and her partner have left to write.
So, 0.25*12=3 Therefore they have 3 pages left to write.