Find the probability of both cream and sugar

At Mom’s diner, everyone drinks coffee. Let ? = the event that a randomly
selected customer puts cream in their coffee. Let ? = the event that a randomly
selected customer puts sugar in their coffee. Suppose that after years of
collecting data, Mom has estimated the following probabilities:

?(?) = 0.6
?(?) = 0.5
?(? ?? ?) = 0.7

What is the probability that a randomly selected customer puts both sugar and
cream in their coffee?
Round your answer to one decimal place.

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P(C and S) = P(C) + P(S) - P(C or S)
=  0.6 + 0.5 - 0.7   {substituted values in}
=  0.4  {added and subtracted}

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