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94 = 2 (5.4 + 5.t + 4.t)
94 = 2 (20 + 5t + 4t)
94 = 40 + 18t
94 - 40 = 18t
54 = 18t
54 : 18 = t
t = 3
V balok = p.l.t
= 5.4.3 = 60 cm2
47 = 20 + 9t
9t = 47 - 20
9t = 27
t = 3 cm