Answer:
n=3
Step-by-step explanation:
20+20+20 length +width+ height
20×3
Well, split it into 3 shapes
21 x 10 = 210
3 x 6 = 18
2 x 6 = 12
210 + 18 + 12 = 240 square cm
imahe for more context
plzzz give me brainliest
That’s easy it’s 18 because the 9x9=18 and there’s a 10s digit