Agroup of 23 friends gets together to play a sport. first, people must be divided into teams. each team has to have exactly 4 players, and no one can be on more than one team. how many teams can they make? (it is possible that not everyone can be on a team.)

they charge the same amount at 20 minutes.

step-by-step explanation:

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.