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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