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p : l = 3y : 2y
k = 2 * ( p + l )
120 = 2 * ( 3y + 2y )
120 = 2 * 5y
120 = 10y
120 : 10 = y
12 = y
P = 3y
= 3 * 12
= 36
L = 2y
= 2 * 12
= 24