Answer:
(1)
![Each\ day = (3)/(20)](https://img.qammunity.org/2022/formulas/mathematics/college/3m5wy4brzv412bjms12dnb2qojyef7dqlc.png)
(2) 12 offices
Explanation:
Given
![Weekend =(1)/(4)](https://img.qammunity.org/2022/formulas/mathematics/college/e49k4hpre6qyka4uooog9wiursjpp35902.png)
First, we need to get the fraction of the rest.
![The\ Rest = 1 - Weekend](https://img.qammunity.org/2022/formulas/mathematics/college/v88acx1lazn7smqeldai6u4t0fzfdzgjef.png)
![The\ Rest = 1 - (1)/(4)](https://img.qammunity.org/2022/formulas/mathematics/college/r4lpbvimggdwx3ll0kvjxhtkfw8b8f4e7g.png)
![The\ Rest = (4-1)/(4)](https://img.qammunity.org/2022/formulas/mathematics/college/p4hwlibld6e8ig0pcf96slyrc33dy5wnem.png)
![The\ Rest = (3)/(4)](https://img.qammunity.org/2022/formulas/mathematics/college/m5xi69d3na27mctjrsyb3jm8y3shjnwfqd.png)
Solving (a): Fraction of each day.
To do this, we simply divide the fraction of the rest by number of days.
![Each\ day = The\ Rest/5](https://img.qammunity.org/2022/formulas/mathematics/college/7xl7xblplqri4l8ncxxuvoa765v517qzca.png)
![Each\ day = (3)/(4)/5](https://img.qammunity.org/2022/formulas/mathematics/college/uimpitdza1et8kbwbnxksadksfz8dpjhtg.png)
![Each\ day = (3)/(4)*(1)/(5)](https://img.qammunity.org/2022/formulas/mathematics/college/136xbmwcj17sf3qzm3kwj6cpncbqaszgsd.png)
![Each\ day = (3)/(20)](https://img.qammunity.org/2022/formulas/mathematics/college/3m5wy4brzv412bjms12dnb2qojyef7dqlc.png)
Solving (b): Thursday
![Shirts = 40](https://img.qammunity.org/2022/formulas/mathematics/college/gszw2jgcrsjsjqjqw88yq00zn68fuxtwds.png)
First, calculate the fraction of both days.
![Both = (3)/(20)+(3)/(20)](https://img.qammunity.org/2022/formulas/mathematics/college/llld6fin1finxr5gblco2wichbhfucy5m3.png)
![Both = (6)/(20)](https://img.qammunity.org/2022/formulas/mathematics/college/9ambe8n2pi21bhmjzeqjgsg42fuo1lgagx.png)
![Both = (3)/(10)](https://img.qammunity.org/2022/formulas/mathematics/college/thex6q4vztepvfz8geaet800vx3um12mlx.png)
So, the number of shirts to iron on these days is"
![Both = (3)/(10) * 40](https://img.qammunity.org/2022/formulas/mathematics/college/mmqule9g2hyiaf7f3cwctac5hbwmf9k3kc.png)
![Both = (120)/(10)](https://img.qammunity.org/2022/formulas/mathematics/college/dv7pn4qwwt0xu256rcg137ac59i8eqwlnj.png)
![Both = 12](https://img.qammunity.org/2022/formulas/mathematics/college/tnhynxv2u0912o1bw19zdz9mrjjan4qrj2.png)