Let c = number of childrenLet t = number of teenagersLet a = number of adults t = 3/4 c 1) c + 3/4 c + a = 5702) 2c + 3 (3/4c) + 5a = 1950 1) 7/4c + a = 5702) 2c + 9/4c + 5a = 1950 1) 7/4c + a = 5702) 17/4c + 5a = 1950 Multiply equation 1 by -51) -35/4c - 5a = -28502) 17/4c + 5a = 1950 Add the equations-18/4c = -900 c = -900 * -4/18 = 200 t = 3/4 c = 150 teenagers