These figures are congruent. What series of transformations moves quadrilateral FGHI onto quadrilateral F'G'HT?
Note: Rotations are clockwise. Reflections are over the x- or y-axis.
O A. Translation, reflection
O B. Rotation, translation
O C. Reflection, rotation
D. Reflection, reflection

correct answer:

i^31 = -i

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.