A sports store made a display by stacking baseball bats in a pile. The bottom row of the pile has 20 bats, and the top row has 14 bats. Each row has 1 fewer bat than the row below. How many bats are used in the display?

The rows contain 20, 19, 18, 17, 16, 15, and 14 bats, since each row has one fewer than the row below. Adding them gives 20 + 19 + 18 + 17 + 16 + 15 + 14 = 119, so the display uses 119 bats.

AI-written and checked against the verified answer.