Answer:
[tex]10\frac {5}{6}[/tex] boxes
Step-by-step explanation:
Given that pens received from the parents' society [tex]= 4 \frac 1 4[/tex] boxes.
Pens received from the Student Society [tex]= 2 \frac 56[/tex] boxes.
Pens received as gift boxes [tex]= 3 \frac 3 4[/tex] boxes.
So, the total number of boxes of pens received [tex]= 4 \frac 1 4 + 2 \frac 56 + 3 \frac 3 4[/tex] boxes
[tex]=\frac {17}{4} + \frac {17}{6} +\frac{15}{4}\\\\=\frac {65}{6}\\\\=10\frac {5}{6}.[/tex]
Hence, the total number of boxes of pens received [tex]= 10\frac {5}{6}[/tex] boxes.