No 22!! Pakai caranya!

kemeja = k
jeans = j

3 kemeja + 2 jeans = 420000
1 kemeja + 2 jeans = 300000

3k + 2j = 420000
k + 2j = 300000
eliminasi
2k = 120000
kemeja = 60000

subtitusi
k + 2j = 300000
60000 + 2j = 300000
2j = 300000 - 60000
2j = 240000
j = 240000/2
jeans = 120000

ditanya =
2 kemeja + 3 jeans = ?
2(60000) + 3(120000)
= 120000 + 360000
= 480000