Compute, O friend, the number of the cattle of the sun which once grazed upon the plains of Sicily, divided according to color into four herds, one milk-white, one black, one dappled and one yellow. The number of bulls is greater than the number of cows, and the relations between them are as follows: White bulls = ( 1 2 + 1 3 ) {\displaystyle =\left({\frac {1}{2}}+{\frac {1}{3}}\right)} black bulls + yellow bulls, Black bulls = ( 1 4 + 1 5 ) {\displaystyle =\left({\frac {1}{4}}+{\frac {1}{5}}\right)} dappled bulls + yellow bulls, Dappled bulls = ( 1 6 + 1 7 ) {\displaystyle =\left({\frac {1}{6}}+{\frac {1}{7}}\right)} white bulls + yellow bulls, White cows = ( 1 3 + 1 4 ) {\displaystyle =\left({\frac {1}{3}}+{\frac {1}{4}}\right)} black herd, Black cows = ( 1 4 + 1 5 ) {\displaystyle =\left({\frac {1}{4}}+{\frac {1}{5}}\right)} dappled herd, Dappled cows = ( 1 5 + 1 6 ) {\displaystyle =\left({\frac {1}{5}}+{\frac {1}{6}}\right)} yellow herd, Yellow cows = ( 1 6 + 1 7 ) {\displaystyle =\left({\frac {1}{6}}+{\frac {1}{7}}\right)} white herd.