L x W L x W L x W
2(10x6) 2(10x5) 2(5x6)
2(60) 2(50) 2(30)
120m² 100m² 60m²
TSA: 120 + 100 + 60 = 280m²
Here is a link to a game to help you more on Surface Area's.Finally here is a video:
Here is a video to help you on volume:
And this is a link to a game on volume.