Actress Vidya Balan on Thursday took to Instagram and announced the release date of her upcoming film “Shakuntala Devi” in a quirky way. As the film is based on the life of the late mathematics genius Shakuntala Devi, Vidya teased her followers with a math problem to decode the release date on their own. “Hi, everyone. I have some exciting news to share. The release date for ”Shakuntala Devi” has been decided and it will release in exactly 148 days from now,” she said in the clip.