Question

The length of a rectangular hall is $4\mathrm{metres}$ less than three times the breadth of the hall. What is the length, if the breadth is $\mathrm{b}\mathrm{metres}$?

Answer 1

Given, the breadth of a rectangular hall $=\mathrm{b}\mathrm{metres}$

According to the question, the length of a rectangular hall is $4\mathrm{metres}$ less than three times the breadth.

$3$ times of breadth $=3\times \mathrm{b}=3\mathrm{b}\mathrm{metres}$

Then the length of the rectangular hall $=(3\mathrm{b}-4)\mathrm{metres}$.

Therefore the length of the rectangular hall is $(3\mathrm{b}-4)\mathrm{metres}$.