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N : Semua = 11 : 25
2. lebar = 6/9 x 42 = 28 cm
nino : rino
11 : 14
maka rino : (rino +nino)
14 : (11+14)
14 : 25
nomor 2
42 = 2(9y + 6y)
42 = 2(15y)
42 = 30y
y = 42/30
y = 1,4
panjang = 9y = 8 x 1,4 = 12,6 cm
lebar = 6y = 6 x 1,4 = 8,4