question: How many shares of berkshire hathway was pledged as a donation
answer: pledged to give the foundation approximately 10 million Berkshire Hathaway Class B shares
turker_answer: Approximately 10 million Berkshire Hathaway Class B shares were pledged as a donation to the foundation .
rule-based: Pledged to give the foundation approximately 10 million Berkshire Hathaway Class B shares was pledged as a donation