Conditional Probability - Choosing without replacement

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We only solve the math problems our subscribers send in! Let us be your Free Online Math Tutor. In this video we learn how to calculate conditional probability - and we make sense of that formula too!
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Coloured cards
Description
A card stack contains white and black cards. Two cards are drawn randomly without replacement. The probability of selecting a white and then a black card is x. The probability of selecting a white card in the first draw is y. You have to find the probability of drawing a black card, given that the first card drawn was white.
The input will contain two lines with x and y respectively.
The output should be displayed as a float(no need to round it off).
Sample Input:
0.2
0.5
Sample Output:
0.4
Execution Time Limit
Default.

rachnabahl
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“Upside down U”💀. Its called intersection.

heyumm
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Please don't call this simple formula ugly.

Ash-bcvw