Answer :

(a) At first,


25 cm = m


= 0.25


Now,


We can check this as follows,



And,



Therefore,


45 : 60 = 12 : 15


Hence,


We can clearly observe that,


They are in proportion.


Thus,


Middle terms are 1 m, Rs 40


And,


Extreme terms are 25 cm, Rs 160.


(b) At first,


We have to check if they are in proportion.


Now,


We can check this as follows,



And,



Therefore,


39:65 = 6 : 10


Hence,


We can clearly observe that,


They are in proportion.


Thus,


Middle terms are 65 l,  6 bottles 


And,


Extreme terms are 39 l, 10 bottles.


(c) At first,


We have check if they are in proportion:


Now,


We can check this as follows,



And,



Therefore,


2 : 80 ≠ 25 : 625


Hence,


We can clearly observe that,


They are not in proportion.


(d) At first,


1l =


2.5l = 2500 ml


Now,


We can check this as follows,



And,



Therefore,


200: 2500 = 4 : 50


Hence,


We can clearly observe that,


They are in proportion.


Thus,


Middle terms are 2.5l, Rs 4


And,


Extreme terms are 200ml, Rs 50

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