A shop charges a fixed delivery fee of 27 taka plus 6 taka for each notebook. If the total cost is 51 taka, how many notebooks were ordered?
Note
Let x be the number of items. The equation is 27 + 6x = 51. Subtract 27: 6x = 24. Divide by 6, so x = 4. The fixed fee is not part of the item count.