There were 10 students in the class on the first day.
Let x be the number of students of the first day.
Given: A college writing seminar increased its size by 50 percent from the first to the second day.
i.e. Number of students on second day = (Number of students on first day)+(50% of Number of students on first day)
= x +50% of x
Since, it is given that the total number of students in the seminar on the second day was 15.
Hence, there were 10 students in the class on the first day.
a rotation about point l
jml angle lkj & angle mj = lm