Karim began his day by drinking 1 cups of milk at breakfast. By the end of the day, he drank a total of 2

1

cups of milk.

3

Which equation and solution correctly represent the amount of milk in cups, m, Karim drank after breakfast?

Equation:

21 = 1 + m

Solution:

20 = m

Step-by-step explanation:

What we know:

Karim drank 1 cup of milk at breakfast Karim drank a total of 21 cups of milk m = the amount of milk, in cups, Karim drank after breakfast

We know that Karim drank 21 cups of milk in a day. In an equation, that would look like this:

21 =

What does 21 equal?

The amount of milk Karim drank at breakfast plus the amount of milk Karim drank after breakfast.

21 = milk at breakfast + milk after breakfast

Let's substitute what we know into this equation:

21 = milk at breakfast + milk after breakfast

21 = 1 + m

Now that we have our equation, let's solve.

21 = 1 + m

-1 - 1

20 = m

Therefore, Karim drank 20 cups of milk after breakfast.