A shop charges a fixed delivery fee of 13 taka plus 12 taka for each folder. If the total cost is 145 taka, how many folders were ordered?
Note
Let x be the number of items. The equation is 13 + 12x = 145. Subtract 13: 12x = 132. Divide by 12, so x = 11. The fixed fee is not part of the item count.