Finley o ile a ya lebenkeleng a reka raese, dinawa le nama ya kolobe go e dirisa kwa lapeng. Go mo tsere metsotso e le 20 go feta go apaya nama ya kolobe go na le raese, fa dinawa di ne di tsaya halofo ya nako ya go apaya nama ya kolobe le raese. Fa go mo tsere metsotso e le 30 go apaya raese, o tsere metsotso e le mekae go apaya dijo tsotlhe? 

Mike's teacher, leaves as homework the reading of a 200-page book. The assignment is to be completed within 30 days. Mike plans to read 10 pages a day. How many days before the deadline will Mike finish his reading?
Fa raese e tsere metsotso e le masome a mararo go apaya, nama ya kolobe e tsere 20+30 = <<20+30=50>>50 metsotso.
Nako yotlhe ya go apaya nama ya kolobe le raese ke 50+30 = <<50+30=80>>80 metsotso.
Dinawa di apeilwe 1/2*80 = <<80*1/2=40>>40 metsotso go apaya.
Palogotlhe ya nako e e tserweng go apaya dijo tsotlhe ke 40+50+30 = <<40+50+30=120>>120 metsotso.
#### 120

Reading 10 pages per day, Mike finishes reading his book in 200 ÷ 10 = <<200/10=20>>20 days.
Mike finishes reading his book 30 - 20 = <<30-20=10>>10 days before the deadline.
#### 10