Someone help please :))

How to use order of operation in 20 divide by 4 multiply 5 = 1

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=

Mis the midpoint of rq if rm equals 2x + 5 and mq equals 4x - 9 what is the length of rq