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550 = 2(150+15t+10t)
550 = 2(150+25t)
550 = 300 + 50t
250 = 50t
T = 5cm
Maaf kalau salah
550 =2x15x10+2x15xt + 2x10xt= 300 +30t+20t=300+50t -->550-300==50t
250=50t--> t=250/50=5
Jadi tinggi balok adalah 5 cm. Moga membantu,