he had never visited Agra before.

At the zoo, Ratan saw a species of primate. He had never even heard of before. He said, it was called a white-faced saki.It had long, dark,spiky fur, a long fluffy tail,forward-facing brown eyes, a white forehead, and yellow cheeks. Based on this information, the white-faced saki could not bean :

Mahendra correctly remember that he visited Bokaro before twelfth of July but after eighth of July. His friend correctly remembers that Mahendra visited Bokaro after tenth of July but before fourteenth of July.On which day of July did Mahendra visit Bokaro?

Bunty remembers that his sister Lali and certainly been in Chapra for one day after 16 th Febryary but before 21 st February while his mother Sarita remembers that Lali had certainly visited Chapra before 20 th February but after 17 th February. If both of them are correct then on which day in February had Lali visited Chapra?