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11 x 5 x (3+x) = 385
55 (3+x) = 385
3+x = 385/55
3+x = 7
x = 4
a. x = 4 cm
b . t = 3+x = 3+4 = 7cm
7 - 3 = X
X = 4
T = 3 +X = 3 +4 = 7