Question

Andrew sold 60 baseball cards to a friend. This was 80% ofAndrew's total baseball card collection. How many totalbaseball cards were in Andrew's collection?

Answer 1

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:

$x\text{ = }\frac{100\text{ x 60}}{80\text{ }}\text{ = 75 cards}$

Then the total baseball cards (100%) in Andrew´s collection were: 75 cards.