Question 22
To make the stamps easier to pull apart, sheets of postage stamps have rows of holes punched into them. In the sheet shown, each stamp has 7 holes along the top and bottom edges, 9 holes along the sides and 1 more at each corner. Holes are included around all four edges of the sheet so the borders can be torn off as well. The full sheet has 20 stamps arranged in 4 rows of 5. How many holes are there altogether?
