2 1/2 rim + 3 1/2 kodi =....lembar

1 rim = 500 lmbr
1 kodi = 20 lembr

2 1/2 rim+ 3 1/2 kodi = 5/2 x 500+ 7/2 x 20
                                  =1250 + 70
                                   =1320 lembar

1 rim = 500 lembar
2 1/2 rim = 1.250 lembar
1 kodi = 20 potong
3 1/2 kodi = 70 potong
1.250+70 = 1.320 lembar

Semoga membantu)"^o^