Answer:
a) 5((2)(1/2)(6)(8) + 16(6 + 8 + 10)) =
5(48 + 16(24)) = 2,160 m²
(2,160 m²)(29 mL/m²) = 62,640 mL
= 62.64 L
b) 2(1/2)(80(6 + 8 + 10)) = 80(24) = 1,920 m²
(1,920 m²)(29 mL/m²) = 55,680 mL
= 55.68 L
62.64 L - 55.68 L = 7.06 L
Lucy would save 7.06 L of paint.