Tolong jawab yaaaa mtk kelas 4

4. a 10/20 = 20/40 = 30/60
    b. 2/7 = 4/14 = 6/21
    c. 4/25 = 20/50 = 60/75
    d. 5/6 = 25/30 = 35/42
    e. 10/5 = 60/30 = 300/90
    f.  8/15 = 16/30 = 24/45
Maaf y, kalo salah.....