10. Hakeem wants to rent a bike. Bike rental costs $1.25 per hour plus a
one-time fee of $3. Which equation
represents the relationship between the
number of hours h Hakeem rents the
bike and the total cost c?

if you're trying to figure out how much each ounce cost it would be 0.20

cents each ounce

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.