One third plus four sixths plus six eighteenths equals blank

1. the following set of data represents the number of waiting times in minutes from a random sample of 30 customers waiting for service at a department store. 4 5 7 10 11 11 12 12 13 15 15 17 17 17 17 17 18 20 20 21 22 22 23 24 25 27 27 31 31 32 a. determine the number of classes and class interval.

How do i do this activity, is appreciated

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?