(k:40):30=120 k:40=120•30 k:40=3600 k=3600•40 k=144000 (144000:40):30=120 120=120.
k÷40=120×3
k÷40=360
k=360×4
k=1440
(k:40):30=120 k:40=120•30 k:40=3600 k=3600•40 k=144000 (144000:40):30=120 120=120.
k÷40=120×3
k÷40=360
k=360×4
k=1440