To find the number of bouncy balls needed for 30 guests, use the ratio of bouncy balls to guests, which is 9:3. First, simplify the ratio to 3:1 (by dividing both numbers by 3). This means there is 1 bouncy ball for every guest.
Next, multiply the number of guests (30) by the simplified ratio (3):
\[ \text{Number of balls} = 30 \text{ guests} \times 1 \text{ ball/guest} = 30 \text{ balls} \]
Therefore, Rachel needs 30 bouncy balls for 30 guests.
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