Answer: <u><em>No. of students in 9th grade = 150 </em></u>
<u><em>No. of students in 10th grade = 300</em></u>
Step-by-step explanation: Total No. of Students = 450
∴No. of students in 9th grade = 1/3 of 450
I.e. = 1/3 × 450 = 150 students in 9th grade.
<em>Let the No. of students in 10th grade be 'x'</em>
x = 450 - 150 = 300 students in 10th grade.
∴No. of Students in 9th grade = 150 students
∴No. of Students in 10th grade = 300 students