Problema Solution
Rob has a baseball card collection. He sells one-fourth of his collection then buys six more sets of baseball cards. If he now has 25 sets of baseball cards, how many did he have before he sold part?
Answer provided by our tutors
Let 'x' represent the number of cards Rob had originally (before selling).
x - (1/4)x+6 = 25
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x = 76/3
x = 25 1/3 sets