105 is a composite number. 105 = 1 x 105, 3 x 35, 5 x 21, 7 x 15. Factors of 105: 1, 3, 5, 7, 15, 21, 35, 105. Prime factorization: 105 = 3 x 5 x 7.
How to solve: (15x10)-(3x3)
Answer(hopefully is right): 291
It would be 50.24 ft
BTW in this case I used 3.14 for pi