Breakdown of Гибкий и умный человек, с которым ты работаешь, решит любую задачу.
и
and
ты
you (singular)
человек
person
работать
to work
Questions & Answers about Гибкий и умный человек, с которым ты работаешь, решит любую задачу.
Why is любую used here rather than всякую?
Любой focuses on free choice, meaning "absolutely any task, no matter which one you pick." It emphasizes that the person can handle whatever you throw at them. Всякий tends to mean "every kind of" or "any typical." While they can sometimes overlap, любую is the most natural choice here to stress absolute capability without exceptions.
Could I say с кем ты работаешь instead of с которым ты работаешь?
Not in this exact structure. You use который (here in the instrumental case, с которым) to refer back to a specific noun in the main clause—in this case, человек. You would use с кем if you were referring back to a demonstrative pronoun like тот, for example: тот, с кем ты работаешь (the one with whom you work).
Is гибкий used for both physical flexibility and mental adaptability?
Yes! Just like in English, гибкий describes physical flexibility (like a gymnast or a wire) but is very frequently used metaphorically to describe a person who is adaptable, agile in their thinking, or willing to compromise.
"Any task" implies a general, perhaps repeated situation. Why use the perfective verb решит?