18 first-year teachers were in the meeting.
In this question, we have been given that a school staff meeting had 60 teachers in attendance, 30% of whom were the first-year teachers.
We need to find the number of first-year teachers present in the meeting.
Let x be the number of first-year teachers present in the meeting.
As 30 percent of school staff are the first-year teachers, we need to find the 30 percent of 60.
Using the formula of percentage,
x = 60 * (30/100)
x = 18
Therefore, the number of first-year teachers present in the meeting = 18
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