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40 cm = 2p + 5cm + p
40 cm = 3p + 5 cm
35 cm = 3 p
p = 35 : 3
panjang = 11 2/3
2 lebar = 5 + panjang
lebar = (5 + panjang) : 2
= (5+11 2/3) : 2
= 16 2/3 : 2
= 50/6 = 25/3