the difference of two numbers is 11 . one third of their sum is 7 . what are the two numbers ?
"let the two numbers be x and y . equation ( i ) : x - y = 11 equation ( ii ) : ( x + y ) / 3 = 7 solve system of equations : x + y = 21 x - y = 11 ( add equations together ) - - - 2 x = 32 - - - x = 16 16 - y = 11 - - - y = 5 since x = 16 and y = 5 , answer b ( 16,5 ) is correct ."
add(subtract(multiply(divide(const_10, const_2), 7), divide(add(11, multiply(divide(const_10, const_2), 7)), const_2)), divide(const_10, const_2))