Dikoloi di eme mo tseleng e kgolo. Dingwe tsa dikoloi di tsamaile mo metsotsong ya ntlha e le 15 ya sekgojane, mme tse dingwe di le 20 tsa feta mo metsotsong e le 15 e e setseng ya sekgojane. Dikoloi di le 5 tsa tswa mo tseleng gore di se ka tsa tsena mo sekgojaneng. Fa go ne go na le dikoloi di le 30 kwa tshimologong, ke dikoloi di le kae tse di tsamaileng mo sekgojaneng mo metsotsong ya ntlha e le 15? 

Cars have lined up on the motorway. Some of the cars drive through in the first 15 minutes of the traffic jam, then 20 more cars drive through in the remaining 15 minutes of the jam. 5 cars from the line take an exit so they don't have to drive through the traffic jam. If there were originally 30 cars on the motorway, how many cars drove through the traffic jam in the first 15 minutes?
Ga go tlhokege gore re bale dikoloi tse di tswileng mo tseleng, ka jalo go ne go na le dikoloi di le 30 kwa tshimologong - dikoloi di le 5 tse di tswileng = <<30-5=25>>25 dikoloi tse di tsamaileng mo sekgojaneng.
Bontsi jwa dikoloi di tswile mo metsotsong ya bofelo e le 15, ka jalo mo metsotsong ya ntlha e le 15, go tshwanetse ga bo go ne go na le dikoloi di le 25 - dikoloi di le 20 tse di tsamaileng mo metsotsong ya bofelo e le 15 = dikoloi di le 5 tse di tsamaileng mo sekgojaneng. 
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The cars that exited do not need to be included so there were 30 original cars – 5 cars that exited = <<30-5=25>>25 cars that drove through the traffic jam.
Most of the cars exited in the final 15 minutes so in the first 15 minutes, there must have been 25 total cars – 20 cars that drove through in the final 15 minutes = 5 cars that drove through the traffic jam.
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