Respuesta :

15.7 Gallons

Each wall is 15*30 = 450
450* 4 walls = 1,800
Area of triangles are 15*15/2 = 112.5
112.5 * 4 triangles = 450
1,800 + 450 = 2,250

2,250/143 = 15.73
The answer is 15.7 gallons