A bookstore sold 320 books in a week, including fiction and non-fiction books. Each fiction book was sold for ₹240, and each non-fiction book for ₹180. If the total revenue earned from all the books sold was ₹65,760, find the absolute difference between the numbers of fiction books and non- fiction books sold.

Ravish paid ₹640 for a jar of 40 chocolates where the amount paid included the cost of the jar. Harish paid a total of ₹1540 for one jar containing 55 chocolates and a second jar containing 45 chocolates, where the amount paid included the cost of both the jars. If all jars cost the same, and all chocolates cost the same, how much (in ₹) would Satish have to pay for a jar containing 35 chocolates, if the amount he has to pay includes the cost of the jar as well as that of the chocolates he bought?

If $x - 2y + 4z = 6$, $3x + y + 5z = 4$ and $2x - y + 3z = 4$, then what is the value of $(2x – 3y + 5z)$?