Yuekaojuan answer primary school

Surface area of the first question: 30+30+20+20+50+50+(5 * 5-3 * 3) * 2 = 232.

Volume: 5 * 5 *10-3 * 3 *10 =160.

Surface area of the second question: 8 *12 * 2+8 * 4 * 2+12 * 4 * 2+4 * 4 * 2 = 384.

Volume: 8* 12*4-4*4*4=320.