if x : y is 1 : 5 and y : z is 5 : 7 then x : z is equal to
the two ratios given are having the same number 5 for y in both the ratios . hence - x : y = 1 : 5 y : z = 5 : 7 = > x : z = 1 : 7 answer d
divide(1, 7)