The formula for solving volume of a square pyramid is: Volume = 1/3*h*b²
Solving for the remaining space to be filled up: 320 = 1/3*h*b² - 1/3*(h/2)(b/2)² 320=1/3hb² - 1/3h/2b²/4 320= 1/3 (7/8hb²) Divide both sides by 7/8: 320(8/7)=1/3hb² Volume = 45.714 cm³
