camila has a younger brother and an older brother one brother is 3 years younger than her and the other is 5 years older than her. the sum of their ages is 74 years. how old is camila?

Marion has a bicycle that she is planning to take for a ride. the rim of the rear wheel lies 41 cm from the center of the wheel. the tire itself has a thickness of 3 cm. in order for marion to ride her bicycle 96,712 cm approximately how many rotations will the rear wheel make?