Mathematics

Problem

A rectangular platform measures

24\,\text{m}

15\,\text{m}

. It is to be enlarged by adding a uniform strip of concrete all around so that the total area becomes

630\,\text{m}^2

. What is the width of the strip? a)

1.5\,\text{m}

3\,\text{m}

6\,\text{m}

3.5\,\text{m}