Bonjour,

1 035 = 3 x 3 x 5 x 23

1 215 = 3 x 3 x 3 x 3 x 3 x 5

1 035/1 215

= [(3 x 3 x 5) x 23]  [(3 x 3 x 5) / (3 x 3 x 3)]

= (45 x 23) / (45 x 27)

= 23/27.