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2350 = (2x25xl) + (2x25x15) + (2x15xl)
2350 = 50l + 750 + 30l
2350 = 80l + 750
2350-750 = 80l
1600 = 80l
l = 1600 : 80
= 20cm
maaf jika jawaban kurang memuaskan :)