Find the ratio of the following:
(a) 30 minutes to 1.5 hours
(b) 40 cm to 1.5 m
(c) 55 paise to Rs 1
(d) 500 ml to 2 litres
(a) We have,
30 minutes = 
= 0.5 hours
Therefore,
Required ratio = 
= 
= 
(b) We have,
1.5 m = 150 cm
Therefore,
Required ratio = 
= 
(c) We have,
Rupee 1 = 100 paise
Therefore,
Require ratio = 
= 
= 
(d) We have,
1 litre = 1000 ml
Also,
2l = 2000 ml
Therefore,
Required ratio = 
= 
= 
= 
20