When your friend is riding a 6.50-kg bicycle, the weight is supported more on the back tire and less on the front tire. If the gauge pressure in each tire is 80.5 lb/in2 and the area of contact between the front tire and the road is 5.63 cm2 and between the back tire and the road is 8.45 cm2 what is your friend's weight? (Give the final weight in Newtons, but note that the pressure is given in lb/in2.)