3. An orphanage has enough bread to feed 30
orphans for 12 days. If 10 more orphans are
added, how many days will the same amount of
bread last?
4. If 4 farmers can plow a 3-hectare land in 6 days,
how long will 8 farmers do it?
5. Twelve painters can paint a building in ten days.
How many painters are needed to paint it in 6
days?​