Curtis threw 15 darts at a dart board 40% of his darts hit bulls eye how many darts did not hit bulls eye

9

Step-by-step explanation:

40%of 15 is 6 15-6 is 9

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.