If abc=defamed MNO =PQr

Which formula finds the probability that a point on the grid below will be in the blue area? p(blue) = total number of squares number of blue squares number of blue squares p(blue) = total number of squares number of blue squares p(blue) = number of white squares

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

3382-299=3383- ? fill in the blank?