Answer: Jerome has left 56 cards.
Explanation:
Since we have given that
Number of packs of baseball cards at a garage sale = 8
Number of cards in each pack = 10
Total number of cards in all is given by
[tex]8\times 10=80[/tex]
Now,
He gave his younger sister 3 cards from each pack ,
So,
Number of cards he gave to his younger sister from each pack = 3
Number of packs were there = 8
So,
Total number of cards he has given to his younger sister is given by
[tex]3\times 8=24[/tex]
So, number of cards left to Jerome is given by
[tex]80-24=56[/tex]
So, there are 56 cards Jerome left with .