jika p:q= 9:17 dan p+q=546, maka nilai q-p adalah?

Kelas 7 Matematika
Bab Aljabar

p/q = 9/17
p = 9q/17

p + q = 546
9q/17 + q = 546
26q/17 = 546
q = 546 . 17/26
q = 357

p = 546 - 357
p = 189

q - p 
= 357 - 189
= 168