Question

Write proportion that can be used to find the cost of 10 notebooks if 3 notebooks cost 1.98$

Answer 1

3 / 1.98 = 10 / x.....3 notebooks to $1.98 = 10 notebooks to $ x
and now u would just cross multiply and solve for x (the cost of 10 notebooks)

Answer 2

Answer:

The answer is 6.6$

Step-by-step explanation:

Firstly, you have to realize that the cost of a notebook is directly proportional to the amount of notebook you want.

So, the relation is:

Let

x=total cost of notebooks

y=amount of notebooks

$\frac{x}{y} =k$

Where k is a constant

Therefore, the cost of 10 notebooks is:

Let z=total cost of 10 notebooks

$\frac{1.98}{3}=\frac{z}{10}\\z=\frac{1.98*10}{3} \\z=6.6$