The admission fee at an amusement park is 1.5 dollars for children and 4 dollars for adults. On a certain day, 271 people entered the park, and the admission fees collected totaled 794 dollars. How many children and how many adults were admitted?

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi, r^3 , where r is the sphere’s radius.