Consider the statement:

Ratio of breadth and length of a hall is 2:5. Complete the following table that shows some possible breadths and lengths of the hall.

Breadth of the hall (in metres)	10		40
Length of the hall (in metres)	25	50	

(i) Firstly,

It is given in the question that ratio of breadth and length of hall is 2: 5

Also, we have:

Length = 50 m

Therefore,

=

5 × breadth = 50 × 2 [By cross multiplying]

5 × breadth = 100

Hence,

Breadth =

= 20 m

(ii) In this part, we have

Breadth = 40 m

It is given in the question that ratio of breadth and length of hall is 2: 5

Therefore,

=

2 × Length = 5 × 40 [By cross multiplying]

2 × Length = 200

Hence,

Length =

= 100 m