this is a simple mathes question.!

  there is a frog in a deeply well …the well is 9 metres deep.

   everyday the frog just jumps 4metres but when the frog jumps 4metres  ,  it will slides 3metres.

   so  the question is:  if the frog wants to jump out of the well . how many days does the frog cost?

.Sorry..I don't know..my mathematic study is not good!! usually I get 5 !! 6 is the best mark!!

hmmm..

u can rey your best to answer my question.

it's very simple..!