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2.(pl+pt+lt) = 376
2.(10.6+10.t.6.t) = 376
60+10t+6t = 376:2
60+16t = 188
16t = 188-60
16t = 128
t = 128/16
t = 8 cm (C)
376/2 = 10t + 60+ 6t
188 - 60 = 16t
128=16t
8=t