Step-by-step explanation:
Blue shirt - 1/6
White shirt - 2/3
Total students - 36
So the answer is
1/6 of the students wearing blue shirts out of 36 are 6.
2/3 (i.e 4/6) of the students wearing white shirts out of 36 are 24.
Remaining 1/6 students are wear shirts other than blue or white are 6.