Jawabanmu

2014-03-24T20:38:53+07:00
Luas Permukaan Balok = 2 (pl + pt + lt)
550   = 2 (15 x 10 + 15 x t + 10 x t )
550   = 2 (150 + 15t + 10t)
550   = 300 + 30t + 20t
550 - 300 = 50t
250  = 50t
250/50 = t
5 = t

harap cek lagi kalau ada salah

2014-03-24T22:01:26+07:00
2pl + 2pt + 2lt = 550 cm²
2( pl+pt+lt) = 550 cm²
2 (150 + 15t + 10t) = 550 cm²
150 + 15t + 10t = 275cm²
25t = 275 - 150
25t = 125
t = 5cm