Overall Grade in Math

Question

If I have an 84% overall in math and I take a quiz that is 35 points and worth 90% of my grade. Is there a certain grade that I can get that will bring my grade to a 90%?

Answer 1

.1(84+9(35))= (84+315)/10

=399/10 = 39.9 =final grade

to get 90 as the final grade

(84+9x)=900

9x=816

x= 816/9= 90 2/3 needed on the quiz worth 90%