When Umbrosia spent 20 minutes on the elliptical trainer and then did circuit training for 25 minutes, her fitness app said she burned 495 calories. When she spent 25 minutes on the elliptical trainer and 25 minutes circuit training she burned 550 calories. Solve the system: 20e + 25c - 495 25e + 25c - 550 for e , the number of calories she burned for each minute on the elliptical trainer, and c , the number of calories she burned for each minute of circuit training. e