How many gallons of a 90% antifreeze solution must be mixed with 100 gallons of 15% antifreeze to get a mixture that is 80% antifreeze? The number of gallons that must be mixed is
(Round to the nearest whole number.)
gallons

The numbers on a football field indicate 10 yard increments. you walk around the perimeter of a football field between the pylons. you walk a distance of 30623 yards. find the area and perimeter of the indicated regions. write your answers as mixed numbers, if necessary. a. one end zone: perimeter: yd area: yd2 b. the playing field (not including end zones): perimeter: yd area: yd2 c. the playing field (including end zones): perimeter: yd area: yd2