Item 17 You have an aquarium in the shape of a rectangular prism. The base is 3 feet by 1.5 feet. The height is 2 feet. How many square feet of glass were used to build the aquarium? (The top of the aquarium is open.) The aquarium was built using___square feet of glass.

step-by-step explanation:

there are 36 inches in a yard

25 : 36 = 0.69 yards (you can round to 0.70)

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.