Problem: Andrew sold 60 baseball cards to a friend. This was 80% of
Andrew's total baseball card collection. How many total
baseball cards were in Andrew's collection?
Solution:
Consider the following diagram:
Solve for x , by cross multiplication:
[tex]x\text{ = }\frac{100\text{ x 60}}{80\text{ }}\text{ = 75 cards}[/tex]Then the total baseball cards (100%) in Andrew´s collection were: 75 cards.
