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no15
sisi yg terpanjang = 4cm
diperbesar menjadi 9 cm
perbandingan panjang= 9 : 4 = 2,25
perbandingan lebar= 3 : ? = 3 x 2,25 = 6,75 (c)
no16
a : b = 3 : 4
(6a + b) : (4a + 5b)
= (6x3 + 4) : (4x3 + 5x4)
= (18+4) : (12+20)
= 22 : 32 = 11:16 (d)