Question

Paper towels are on sale at 6 rolls for n dollars. How do you write an expression that represents the cost of 4 rolls of paper towels?

Answer 1

The expression would write `4r=2/3n` (where r=paper towel rolls).

Explanation:

Let's think about this. Since 6 rolls cost `n` dollars, that would have to mean that 1 roll costs `1/6n` dollars. Therefore, we can safely say that 4 rolls cost `4/6n`, or `2/3n`, dollars.