pakai caranya kak 1 - 5

no 1= 15/2:1/4=15/2 dikali 4/1=60/2 disederhanakan =30.
no. 2=42/10 dikali 50 =210
caranya=50:10=5 dikali 42 =210
no. 3=81/2=17/2 dikali 25/100=34
no. 4=65/10:1/4=65/10 dikali 4/1=26
no. 5=7/2:1/4=7/2 dikali 4/1=28/2=14