tolong dijawab dengan cara no 12

botol tinta = x
kotak pena = y
2x = 4y <=> x = 2y

5x + 3y = 195000
5 . 2y + 3y = 195000
10y + 3y = 195000
13y = 195000
y = 15000
x = 2x15000 = 30000

3x + 6y = 3 . 30000 + 6 . 15000 = 90000+90000 = 180000 ... B