Question 1166852
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By the definition of the CONDITIONAL PROBABILITY,


    P(C|D) = P(C AND D) / P(D).


So, we have  0.6 = P(C AND D) / 0.5.


It implies  P(C AND D) = 0.6*0.5 = 0.3.    <U>ANSWER</U>
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Solved.


Notice that this info  &nbsp;" Let P(C) = 0.4 " &nbsp;is excessive; &nbsp;it was not used in the solution, &nbsp;and therefore is &nbsp;IRRELEVANT &nbsp;to the problem.