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120 = 30a
a = 4
5a = 5(4) = 20 cm
12a = 12(4) = 48 cm
13a =13(4) = 52 cm
120 = 30x
x = 120 / 30
x = 4
5x = 5. 4
= 20
12x = 12. 4
= 48
13x = 13.4
= 52