Answer: Number of white socks Fran has =18
Number of white socks Mia has = 9
Explanation:
Since we have given that
Fran buys socks in such a way that it contains nine pairs of white socks for every three pairs of blue socks i.e.
Ratio becomes

Similarly,
Mia buys socks and packages in such a way that it contains two blue pairs for every one white pair
So, ratio becomes

Now, from the case of Fran, we have given that she has 6 pairs of blue socks .
So, we get that

Similarly,
From the case of Mia , we have given that she has 6 pairs of blue socks .
we get that

So, Number of white socks Fran has =18
Number of white socks Mia has = 9