There are 450 students in the 9th and 10th grade taking geometry, and 1/3 of them are 9th graders

There are 150 9th graders and 300 10th graders

Answer: No. of students in 9th grade = 150

No. of students in 10th grade = 300

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.

Let the No. of students in 10th grade be 'x'

x = 450 - 150 = 300 students in 10th grade.

∴No. of Students in 9th grade = 150 students

∴No. of Students in 10th grade = 300 students