3/5 because there are three striped balls in the velvet bag
(x + 8)(x - 8)
x(x - 8) + 8(x - 8) =
x^2 - 8x + 8x - 64 =
x^2 - 64 <===
1 pound on earth = 0.17 pound on moon
17 1/2 pounds on earth = x pound on moon
Answer: 14.525 pounds.
Hope this helps. - M