Tolong di jwb dgn bnr yh

L.p balok = 2 (p.l + p.t + l.t)
500 = 2 (15×4 +15×t + 4×t)
500 = 2 (60 + 15t+4t)
500 = 120 + 30t + 8t
500 = 120+38 t
500-120 = 38t
380 = 38t
380÷38 = t
10 = t
jawabannya C


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