Question

a force of 591 lb is required to pull a boat up a ramp inclined at 17.0 with horizontal how much does the boat weight

Answer 1

I think that boat weight 2021.399 lb:

I calculate by right triangle:

http://www.hackmath.net/en/calculator/triangle-calculator?what=rt&a=a%3D591+A%3D17&submit=Solve

591 = G sin 17

Answer 2

see also similar example:

http://www.hackmath.net/en/example/906