Answer:
I.
1.) 15/20 = 3/4
2.) 18:50 = 9/25
II.
3.) 4:n = 6:9
4×9= 36
36÷9= 6
n = 6
4.) 3/n = 2/5
3×5= 15
15÷2= 7.5
n = 7.5
III.
5.) 4 days = 48 hours
(4×24= 48)
6.) 45 minutes = 2700 seconds
(45×60= 2700)
7.) 1.5 years = 547.5 days
(1.5×365= 547.5)
IV.
occupied room : vacant room
7 occupied room : 3 vacant room
Final Answer:
7:3
