Question

60 pens in 25 boxes
12 pens in y boxes

Answer 1

This is proportional so: \[\frac{ 60 pens }{ 25boxes } = \frac{ 12pens }{ yboxes }\] Then you would just cross multiply:
60y = 300
Divide both sides by 60:
y = 300 / 60
y = 5 boxes

Answer 2

yerp ~ setting up the proportion iz exactly how u would've solved this one *^.^*

Answer 3

SpooksDF is correct