this summer I'm going to earn money mowing lawns. I can mow 2/3 of a lawn in 1 hour. my friend told me that if I work for 5 hours, I can multiply 5 x 2/3 to find the number of Lawns I've moved but I said that in five hours, I'd mow 2/15 does my answer seem reasonable?

That's not enough information to calculate your grade from.

-- You've told us the scores you have in things that go together
to make up (35 + 5 + 25) = 65%  of your grade.

-- We don't know your scores in the things that make up the other
35% of your grade.