To find the value of \( c \), we first need to determine how many baseball cards are left after Darryl gave 20 cards to his sister.
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Calculate the remaining cards: \[ \text{Remaining cards} = \text{Total cards} - \text{Cards given to sister} = 68 - 20 = 48 \]
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Distribute the remaining cards equally among 6 friends: \[ c = \frac{\text{Remaining cards}}{6} = \frac{48}{6} = 8 \]
So, the value of \( c \) is \( 8 \). Each friend received 8 baseball cards.