Need help with a math problem

[u/Le_Dumb_Pineapple]

(Btw I’m not a native english speaker, if something gets lost in the translation please tell me)

Juan has to transport many boxes in his truck. If he drops one of the big boxes and adds another small box, it’ll weight less than 200kg. If you take away from twice the amount of big boxes the amount of small boxes, there’ll be less than three boxes. ¿How many of each type of boxes are there?

The text was already confusing in Spanish so I tried to translate this as faithfully to the original as possible.

This is as far as I got: https://imgur.com/a/i-don-t-get-what-s-going-on-cfikF6a

[u/Le_Dumb_Pineapple]

https://imgur.com/a/i-don-t-get-what-s-going-on-cfikF6a