Martin was 10 years old last year. This year, His brother's age is 2 times of Martin's. How old is Martin's brother this year?​

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=