Hall = 820 seats. Ticket sales = 648. One usher said ¾ full, another ⅔. Whose guess is better?
First usher
Actual fraction = 648 ÷ 820 ≈ 0.79. ¾ = 0.75, ⅔ = 0.667. Closer to 0.75, so first usher is correct.