Question

At the craft store, Maura bought a bag of red and purple marbles. She received 30 marbles in all. 6 of the marbles were red. What percentage of the marbles were red?

Write your answer using a percent sign (%).

Answer 1

To find the percentage of red marbles, we can use the formula for percentage:

\[
\text{Percentage of red marbles} = \left( \frac{\text{Number of red marbles}}{\text{Total number of marbles}} \right) \times 100
\]

In this case, Maura has:

- Number of red marbles = 6
- Total number of marbles = 30

Substituting these values into the formula gives:

\[
\text{Percentage of red marbles} = \left( \frac{6}{30} \right) \times 100
\]

Calculating the fraction:

\[
\frac{6}{30} = 0.2
\]

Now, multiplying by 100 to convert to percentage:

\[
0.2 \times 100 = 20
\]

Thus, the percentage of the marbles that were red is:

\[
\boxed{20\%}
\]