One third plus one half

5/6

Step-by-step explanation:

So 1/3 + 1/2 turn them to equivalent denominators so 1/3 = 2/6

1/2 equals 3/6 . 3/6+2/6 is 5/6

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.