MicroStrategy Software Engineer In Test interview questions

First round was HR calling us and asking all about our background and he explained some benefits of the company and he asked few questions like whether I was doing automation or Regression testing Few days later they scheduled Phone Screen. It was all asking about the previous company experience and few questions like if I give you a login log out application what are your test cases for it. How to locate an element using selenium webdriver? and One brain teaser in the end like "You have two buckets. One holds exactly five gallons and the other three gallons. How can you measure exactly four gallons of water into the five gallon bucket"