Ablank is part of a line between two endpoints

acute angle
line segment
obtuse angle
ray
right angle
straight angle

my guess would be b and d, but i didn’t actually get out the pen and paper. lol

it would rotate about 180 degrees.

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.