SOLUTION: I have two more sisters than brothers. Each of my sisters has two more sisters than brothers. How many more sisters than brothers does my oldest brother have?

From the first two sentences, it is clear that "I", the person who tells the story, is one of sisters.


Let x be the number of boys in the family and y be the number of girls.

Them you have this equation


    y-1 = x + 2       (left side y-1 is the number of sisters to "I")


From this equation,


    y = x + 3.


It says that the number of girls in the family is 3 more than the number of boys.


Hence, the oldest brother (the oldest boy) has 4 more sisters than brothers.    ANSWER



For example the possible numbers of boys and girls can be


    boys      girls


     2         5

     3         6



Having this small table, you can check and confirm my final answer.