Terene e na le bapalami ba le 172.  Fa go ema la ntlha, bapalami ba le 47 ba a fologa mme ba bangwe ba le 13 ba a palama.  Fa go ema la bobedi, bapalami ba bangwe gape ba le 38 ba a fologa.  Go setse bapalami ba le kae mo tereneng?

Carson lives in an old house where the pipes will freeze if the temperature inside the house falls below 32 degrees. Every log of wood Carson burns heats the house up by 5 degrees. If it was 45 degrees during the day, and it's 33 degrees colder during the night compared to the day, how many logs does Carson need to burn to prevent the pipes from freezing?
Fa go ema la ntlha, go fologa bapalami ba le 47 mo go ba le 172 mme go sala bapalami ba le <<172-47=125>>125 mo tereneng.
Go tsena bapalami ba bangwe ba le 13 mme palo ya bapalami e nna  125 + 13 = <<13+125=138>>138.
Fa go ema la bobedi,  bapalami ba le 38 ba a fologa mme go sala bapalami ba le 138 - 38 = <<138-38=100>>100 mo tereneng. 
#### 100 

First find the night-time temperature: 45 degrees - 33 degrees = <<45-33=12>>12 degrees
Then find how much Carson needs to heat his house to avoid the pipes freezing: 32 degrees - 12 degrees = <<32-12=20>>20 degrees
Then divide the amount of heat Carson needs by the amount of heat each log produces: 20 degrees / 5 degrees/log = <<20/5=4>>4 logs
#### 4