Question: Fill in the blank.
Krystal has 4 times as many $2 notes as $1 coins. The total value is $54. How many $2 notes does she have?
There are ______ $2 notes.
1. **State the problem:**
Krystal has some $1 coins and $2 notes. The number of $2 notes is 4 times the number of $1 coins. The total value of all coins and notes is $54. We need to find how many $2 notes she has.
2. **Define variables:**
Let the number of $1 coins be $x$.
Then the number of $2 notes is $4x$.
3. **Write the equation for total value:**
The total value from $1 coins is $1 \times x = x$.
The total value from $2 notes is $2 \times 4x = 8x$.
So, total value equation:
$$x + 8x = 54$$
4. **Simplify the equation:**
$$9x = 54$$
5. **Solve for $x$:**
$$x = \frac{54}{9}$$
$$x = 6$$
6. **Find the number of $2 notes:**
Number of $2 notes = 4x = 4 \times 6 = 24$
**Answer:**
There are 24 $2 notes.