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2×(pl+pt+lt) = 350
(3x-2)×10 + (3x-2)×15 + 10×15 = 350:2
30x-20 + 45x-30 + 150 = 175
75x+100 = 175
75x = 175-100
x = 75:75
x = 1
b. p = 3x-2
p = 3×1-2
p = 3-2
p = 1 cm
V = plt
V = 1×10×15
V = 150 cm³