arithmetic sequence

we can do 84-9 and get 75 

now we have to do 32-5=27

 

so the common difference is 25/9

 

now we can count up from the 5th term to the 23rd term 

 

that's 18 terms to count 

 

18*25/9 is 50

 

so 50+9=59 as our answer