It may be the wording of the question, but I'm not sure how to go about doing this. This is not a homework question I just want to know if my answer is correct. *Please note the wording is confusing, but please interpret however you understand.
90% of candidates to a job position can code both in Python and Perl. 70% of these candidates can code in Python and 50% can code in Perl. What is the probability that a candidate can code in Perl knowing that he can code in Python?'
The way I interpreted this was that the probability that a candidate can code in both is 20% (is this assumption correct?) In the end I found that the answer is 2/7.
If someone can verify this I would be very thankful, as I'm not sure I went about it the right way!