Arcus had 8/9 of a pack of construction paper. he used 1/5 of the paper to make paper airplanes. what fraction of the original pack did arcus use to make paper airplanes?

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

I'm confused on this could anyone me and show me what i need to do to solve it.

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.