diketahui 39:91=(p+l):(3p+1),nilai p

3p+ 1 = 91
3p = 91-1
3p = 90
p = 30

jawab

39/91 = (p+1) /(3p+1)

91(p+1) = 39(3p+1)
91p + 91 = 117 p + 39
(91-117)p = 39 - 91
-26 p = - 52
p = 2