question: Henry Grey matriculated at Trinity College in 1615, and was granted an M.A. that year, during the visit of King James I of England. He married Lady Anne Cecil, daughter of William Cecil, 2nd Earl of Exeter by his second wife, Elizabeth Drury. Lady Anne Cecil was the heiress of the borough and manor of Stamford. In March 1628, Henry was created Earl of Stamford. Just before the outbreak of the English Civil War, he was included as one of the opponents of King Charles I of England, and was made lord lieutenant of Leicestershire. After some operations around Leicester, he occupied Hereford, and when compelled to abandon the city, marched to Cornwall. At the Battle of Stratton, on 16 May 1643, his troops were beaten by the Royalists; driven into Exeter, the Earl of Stamford was forced to surrender the city after a siege of three months. He was certainly no general, and was charged with cowardice. He took no further part in the military operations of the war, although once or twice he was employed on other businesses. The ravages of the Royalists had reduced him to poverty, and distrusted by the House of Commons, he had great difficulty in getting any compensation from Parliament. After a period of retirement, he declared for King Charles II of England during a rising in August 1659, and was arrested, but was soon released. Henry Grey died on 21 August 1673; his earldom passed to his grandson, Thomas Grey, 2nd Earl of Stamford.
Answer this question: Who was Thomas Grey's grandfather?
answer: Henry Grey

question: A central feature of the white community in Rhodesia was its transience, as white settlers were just as likely to leave Rhodesia after a few years rather than permanently settle; for example, of the 700 British settlers who were the first white settlers, arriving in 1890, only 15 were still living in Rhodesia in 1924. As the white population of Rhodesia had a low birth rate (18 per 1,000 compared to the African rate of 48 per 1,000), to maintain white population growth was largely dependent upon taking in new white immigrants with immigration accounting for 60% of the growth of the white Rhodesian population between 195572. However, the American historian Josiah Brownell noted that the turnover rate for white residents in Rhodesia was very high, as Rhodesia took in a total of 255,692 white immigrants between 195579 while the same period a total of 246,583 whites emigrated. Even during the boom years of the late 1950s, when Rhodesia took in an average of 13,666 white immigrants per year, mostly from the United Kingdom and South Africa, an average of about 7,666 whites emigrated annually. Between 196165, Rhodesia took in an average of 8,225 white immigrants per year while also having an average white emigration of 12, 912 per year. Many prospective white immigrants in Rhodesia arrived seeking economic opportunities and departed with fluctuations in the security situation as the Bush War intensified. A substantial number were uninterested in settling there permanently and did not apply for Rhodesian citizenship, despite a much-publicised 1967 campaign urging them to do so. Brownell asserted that patriotism in the white community was "shallow" due to its essentially expatriate character. Brownell also claimed that the majority of white immigrants in the late 1960s and early 1970s were unskilled laborers who competed with the countrys black African workforce and did not contribute badly needed technical or professional skills to the country. He argued that this was due to a government policy aimed at making white immigration as "unselective as possible" and guaranteeing every white immigrant a job.
Answer this question: How many of the 700 British settlers were no longer living in Rhodesia in 1924?
answer:
685