Physics question? IDK how to do the formula they're asking for?

Question

Soft drinks are commonly sold in aluminum containers. How many such containers are thrown away or recycled each year by U.S. consumers? (Assume an average of 4 cans per person each week and a population of 290 million. Type your answer using one of the following formats, 1.2e-3 for 0.0012 and 1.20e+2 for 120.)

can/yr

How many tons of aluminum does this represent? (Assume an average weight of 0.40 oz of aluminum per can.)

tons/yr

Answer 1

Since there are 52 weeks in a year, then the average person would have consumed = 52 * 4 = 208 cans per year

For a total population of 290 million, the total number of containers involved would be

290,000,000/208 =  1.39e+6

and this would weigh

5.56e+5 tons/year

Hope this helps.

Answer 2

You have all the info just multiply

4 / person-week x 52 wk/yr x 290e6 person = 60320e6 cans

this is 6e10 cans

6e10 x 0.4 oz x 1 ton /32000 oz = 0.75e6 tons or 7.5e5 tons

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