perhatikan gambar berikut tentukan nilai p

3/9 = p/12
9p = 12 x 3
9 p = 36
p = 4

9/12=3+9/(p+12)
9/12=12/(12+p)
(p+12)9=12×12
9p+108=144
9p=144-108
p=36÷9
p=4