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550 = 300 + 50x
250 = 50x
x = 5
Maka,
550 = 2(pl + pt + lt)
275 = pl + pt + lt
275 = 15.10 + 15.t + 10.t
275 = 150 + 15t + 10t
275 = 150 + 25t
25t = 275 - 150
25t = 125
t = 125/5
t = 5 cm