A farmer needs to plant seeds on a plot of land. She will plant 300 seeds in a rectangle in the field. The rectangle will have E seeds in a row and F seeds in a column. If the number of seeds in a row is no less than 10 and no more than 30, how many different combinations of rectangular shapes are possible?	Choose the correct choice from the following.
A) 5
B) 6
C) 7
D) 8
E) 9
firstly factors of 300 = 1,2,3,4,5,6,10,12,15,20,25,30,50,60,75,100,150,300   the question says each row will have seeds no less than 10 and no more than 30,   therefore, we should be interested in the factors between 10 and 30 (inclusive)   10(in each row) * 30(number of columns) =300, similarly   12 * 25   15 * 20   20 * 15   25 * 12   30 * 10   total possibilities = 6   option 6
<result>B</result>
A farmer needs to plant seeds on a plot of land. She will plant 300 seeds in a rectangle in the field. The rectangle will have E seeds in a row and F seeds in a column. If the number of seeds in a row is no less than 10 and no more than 30, how many different combinations of rectangular shapes are possible?