Please help me with these 3 (last one is optional if you want to do it) but please don’t give me link to anything or you will get reported

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.

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?