problem solved

there was a day when our teacher,math teacher gave us a sum that was technical hard and every one was not able to work it out..
I went to my father who was  teacher i asked him about the sum which was totally difficult.
He taught me the sum and i was very thankful to him.i went to school, and taught other friends how to do the sum and we were all happy. 

Location: lucky summer, NAIROBI, KENYA