The practical problems of multiplying fractions by integers More than 20

The practical problems of multiplying fractions by integers More than 20

A, B, C three people to buy books, B buy books than a 7 / 3 of the book 3, C buy books than a 5 / 2 of the number of books less than a 1. So the three people in total at least bought how many books? 1, a, B, C can only buy the whole number of books 2, B buy books is a 7 / 3 of the book 3, C buy books than a 5 of the number of books