Three times a certain number plus it is 20 more than that certain number what is the missing number

Using inductive reasoning, what are the next two number in this set? 2,3/2,4/3,5/4,

Select the correct answer from each drop-down menu. let c(g) be the total cost, including shoe rental, for bowling g games at pin town lanes. c(g) = 5g+3 so, c(6) = 8? 33? 30? or 14? this means that for a $6 shoe rental? for $6 per game? for 6 games? for a total cost of $6? , the games are $8 each? total cost is $33? number of games is 14? or total cost is $30? reset next

Me because i don't understand how to do it.: )