# Question #9ad4b

##### 1 Answer

#### Answer:

6 metres

#### Explanation:

Metaphorically speaking, open up the hall like a box so that all the walls form 1 rectangle. We are given the length of this rectangle as 250m

Known

Total cost

Cost for each

Perimeter

Let the total surface area of the wales be

Let the height of the walls be

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Total

,..............................................................................

Divide both sides by 250

But

Approximately 19.7 feet high. That's a lot of wall !