16kg+30ons=brp hg.  12kg-100ons=brp ons.  4kodi+5kodi=brp helai.

16 kg + 30 ons = ... hg
(16 x 10) + (30 x 1) = 160 + 30 = 190 hg

12 kg - 100 ons = ... ons
(12 x 10) - (100 x 1) = 120 - 100 = 20 ons

4 kodi + 5 kodi = ... lembar
(9 x 20) = 180 lembar