In a certain high school graduating class, 60 percent of the students.

In a certain high school graduating class, 60 percent of the students plan to attend college, and 40 percent of the students have grade point averages (GPAs) of 3.0 or above. If 30 percent of the students who plan to attend college have GPAs of 3.5 or above, how many of the students who plan to attend college have GPAs of 3.5 or above?

(1) 90 of the students who plan to attend college have GPAs of 3.0 or above.
(2) 90 of the students in the graduating class have GPAs of 3.5 or above.


I thought each of them was enuf to solve.
So the total students = a
Information given:
Those who plan to go to college = 0.6a
Those who have GPA 3.0 above = 0.4a -> those who have GPA 3.5 above = 0.6a
30% of 0.6a = 0.18a Those who plan to attend college and have GPA 3.5 above -> 0.6a - 0.18a = 0.42a - Those who plan to attend to college and have GPA 3.0 above
Question: 0.18a = ?

(1) 90 of the students who plan to attend college have GPAs of 3.0 or above.
0.42a = 90
=> We will know the value of a -> 0.18a
=> Suf

(2) 90 of the students in the graduating class have GPAs of 3.5 or above.
0.6a = 90
=> Like (1)
=> Suf

Can anyone please correct me?

One mistake you are making is marked in red.

40 percent of the students have grade point averages (GPAs) of 3.0 or ABOVE, so 60 percent of the students have grade point averages (GPAs) of BELOW 3.0.

In a certain high school graduating class, 60 percent of the students plan to attend college, and 40 percent of the students have grade point averages (GPAs) of 3.0 or above. If 30 percent of the students who plan to attend college have GPAs of 3.5 or above, how many of the students who plan to attend college have GPAs of 3.5 or above?

(1) 90 of the students who plan to attend college have GPAs of 3.0 or above.
(2) 90 of the students in the graduating class have GPAs of 3.5 or above.