Answer:
Let's solve this with 3 calculations
1) Volume of the lower section (highlighted in blue)
3 cm hgt 16 cm long 3 cm wide
Volume = 3 * 3 * 16 = 144 cubic cm
2) Volume of left "block"
Volume = 4 cm hgt * 4 cm long * 3 cm wide =
4 * 4 * 3 = 48 cubic cm
3) Volume of right "block"
length = 16cm - 3 - 4 - 3 = 6 cm
Volume = 4 cm hgt * 6 cm long * 3 cm wide =
4 * 6 * 3 = 72 cubic cm
TOTAL VOLUME = 144 + 48 + 72 = 264 cubic cm
Explanation: