At a certain diner, a hamburger (H) and coleslaw (C) cost $3.59, and a hamburger and french fries (F) cost $4.40. If french fries cost twice as much as coleslaw, how much do french fries cost?
here is my way.
then i have two equation:
which is solved like:
but multiplying 0.81 by 2 gives us 1.62, which is not stated among choices. this time, am i wrong or our chinese friends from down3.net are?