I am 18, A college student. I am very skinny throughout my whole secondary school (48-51 kg),172 cm.

  I saw a post recently at this forum about weight gaining advice and the advice I get is eat as much as I can and workout, but the real problem is as you can see, I am a college student and I cannot afford that much of foods.
 

  So I am hoping for some advice from you guys. Thanks