kak plis.. mohon bantuanya kak no 15,16,18,19,20..sma caranya.. plis besok dikumpulin soalnya

15. 1,5 - 3/5 - 7/10 = 15/10 - 6/10 - 7/10 = 9/10 - 7/10 = 2/10 = 1/5 = 0,2 jawabnya A

16. 1,2 : 80% × 8/9 = 12/10 : 8/10 × 8/9 = 12/10 × 10/8 × 8/9 = 120/80 × 8/9 =3/2 × 8/9 = 24/18 = 12/9 = 1 3/9 = 1 1/3 jawabnya A

18. 1 abad + 3 lustrum - 6 windu = 100 + 15 - 48 = 115 - 48 = 67 tahun jawabnya B

19. 80.000 - 25.000 = 55.000 m = 55 km jawabnya A

20. 6 kodi = 6 × 20 = 120 lembar jawabanya C