Problema Solution
Brian gave 20% of his baseball cards to scott and 15% to adam. If he still had 520 cards, how many did he have originally?
Answer provided by our tutors
let x = the number of cards Brian had originally
x - (0.20x + 0.15x) = 520
x(1 - 0.20 - 0.15) = 520
by solving we find
x = 800 cards
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Brain had 800 cards originally.