two brothers took the gmat exam , the higher score is x and the lower one is y . if the difference between the two scores 1 / 4 , what is the value of y / x ?
"answer is c : 1 / 5 x - y = ( x + y ) / 4 solving for y / x = 1 / 5"
add(4, divide(multiply(4, 1), 4))