tolong jawab dong dari no12-15 & 19-20

19. Nino bersepeda selama 4 menit 20 detik
1 menit 60 detik = 4× 60 menit = 260 detik + 20 detik = 260 detik

C

13). D
2/5 + 1,2 - 80%
= 2/5 + 12/10 - 80/100
= 2/5 + 12/10 - 8/10
= 4+12-8/10
= 8/10
= 4/5

14). C
1/2 + 3/4 + 2/5
= 10+15+8/20
= 33/20
= 1 13/20

15). A
persediaan = 4,25 = 4 1/4
adonan yg dibuat = 1 1/4 (2) = 2 1/2

jumlah sisa
4 1/4 - 2 1/2
= 17/4 - 5/2
= 17-10/4
= 7/4
= 1 3/4

19). C
t = 4menit + 20detik
t = (4*60) + 20
t = 240 + 20
t = 260

20). D
8kodi + 16lembar + 1 1/2kodi
= (8*20) + 16 + (3/2 * 20)
= 160 + 16 + 30
= 206