Total cost of 45 books and 65 copies is 1290 and that of 65 books and 45 copies is 1500. What will be cost of 1 book?

Question

A bottle and a cork together cost $1 and Penny 1. If the cost of bottle is more than that of the cork by $1, what is the cost of the bottle and that of the cork?

Answer 1

b= cost of 1 book , c=cost of 1 copy

9b + 13c = 258 ;;; 13b + 9c = 300 ;;

solving we get b=Rs. 17.93