Question

How many cups of water do you need for 5 cups of flour? You can think about this as, "
2
1
​
multiplied by
4
5
​
is what number?"

×
4
5
​

×
4
5
​

Cups of Flour Cups of Water
4
2
1
​

5


2
1
​
·
4
5
​


=
1 · 5
2 · 4
=
5
8

Answer 1

To determine how many cups of water are needed for 5 cups of flour, we can use the same ratio that you've mentioned between cups of flour and cups of water.

According to the information provided:

- For 4 cups of flour, you need 2 cups of water.

To find the number of cups of water for 5 cups of flour, we can set up a proportion based on the ratio of flour to water:

\[
\frac{2 \text{ cups of water}}{4 \text{ cups of flour}} = \frac{x \text{ cups of water}}{5 \text{ cups of flour}}
\]

Now we can solve for \( x \):

Cross-multiply:

\[
2 \cdot 5 = 4 \cdot x
\]

This simplifies to:

\[
10 = 4x
\]

Now, divide both sides by 4:

\[
x = \frac{10}{4} = 2.5
\]

Thus, you need **2.5 cups of water** for 5 cups of flour.