9.A

9.A to attend more than 20 students but fewer than 40 students. A third of the pupils wrote a math test to mark 1, the sixth to mark 2, the ninth to mark 3. No one gets mark 4. How many students of class 9.A wrote a test to mark 5?

Correct answer:

n =  14

Step-by-step explanation:

3 ...  prime number 6=2⋅3 9=32 LCM(3,6,9)=2⋅32=18  m=LCM(3,6,9)=18 20<=t<=40 t=2m t=2⋅ m=2⋅ 18=36 n=t⋅ (1−1/3−1/6−1/9)=36⋅ (1−1/3−1/6−1/9)=14

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