An aircraft uses 1680 gallons of fuel, the left tank uses 45% the right tank uses 32.5%, how much was used by the center tank? Algebra Linear Equations Percent Equations 1 Answer EZ as pi · Mark D. May 17, 2018 #22.5% or 378# gallons Explanation: #45%+32.5%=77.5%# #100%-77.5%=22.5%# #22.5/100 xx 1680# #=378# gallons Answer link Related questions Jimmy made a #"75%# on a test worth #46# points. How many points did he get correct? How do you use proportions to solve percent equations? How do you translate percent problems into an equation? What number is 32% of 600? What number is #3/4#% of 16? 8 is 20% of what number? 99 is 180% of what number? What percent of 7.2 is 45? What percent of 150 is 5? What is 2% of 92? See all questions in Percent Equations Impact of this question 1888 views around the world You can reuse this answer Creative Commons License