Question

the length and breadth of a Hall in the ratio 3 is to 2 if the breadth of the hall be 21 metres find its length.

Answer 1

length=3x
breadth=2x
given that
2x=21
x=10.5
length=3x=3(10.5)=31.5

Answer 2

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Here is your answer

Let the length and breadth is 3x and 2x

Breadth = 21 m
$2x = 21 \\ x = \frac{21}{2}$
Therefore
Length is
$= \frac{3 \times 21}{2} \\ = \frac{63}{2} m$

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