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120 = 2 × (3x + 2x)
120 = 2 . 5x
120 = 10x
x = 12
lebar kan perbandingannya 2 maka:
2x = 2 × 12
= 24 cm
lebarnya adalah 24 cm
p=3x
l=2x
K= 120
K= 2 (p+l)
120 = 2(3x+2x)
120:2 = 3x+2x
60 = 5x
x=12
lebar = 2x = 2*12 = 24