To celebrate the first day of school, Reagan brought in a tray of caramel brownies and walnut brownies. The tray had a total of 20 brownies, of which 10% were caramel. How many caramel brownies did Reagan bring?

2

Step-by-step explanation:

Reagan brought 2 caramel brownies.

Solve using a proportion.

=

You're trying to find how many brownies he brought were caramel. We know Reagan brought a total of 20 brownies. Therefore since you don't know how many caramel brownies he brought, the fraction would be ?/20. Next, you know he brought brownies in which 10% were caramel. In proportions, the denominator would be 100% since that is the total percentage. Therefore, the proportion would be 10%/100%. Now we just have to cross multiply.

Proportion:

=

10 x 20 = 200

200/100= 2

Thus, Reagan brought 2 caramel brownies.

x is variable or an unknown value to find

example:

2x = 5 which means x = 3