tentukan nilai p,q,dan r pada perbandingan p:q:r= 3:7:5 dan 3p-2q+4r=105.PAKAI CARA!!!

p:q:r = 3:7:5 = 3x : 7x : 5x
3 + 7 + 5 = 15

p = 3x
q = 7x
r = 5x

3p - 2q + 4r = 105
3(3x) - 2(7x) + 4(5x) = 105
9x - 14x + 20x = 105
15x = 105
x = 105 ÷ 15 = 7


[Jawab]
p = 3(7) = 21
q = 7(7) = 49
r = 5(7) = 35



Semoga membantu ya, maaf kalau salah ^-^