Convert the fractions to decimals.
3/20
7/50
9/25
4/15
1/9
9/40
5/16
7/9
13/20
37/50
11/30
19/40

nope.   happens to me as well.

-aparri

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.