Could someone help me with this please?

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 tt of tokens james has is a function of gg, the number of games he plays

You can find the constant of proportionality by finding the ratio of

Multiply. write your answer in simplest form. 3/8 x 5/7