Question

I am an Odd composite number.
I am a common factor of $27$ and $45$.
I am less than $11$.
What number am I?

• A. $15$
• B. $9$
• C. $3$
• D. $5$

Answer 1

The correct option is B $9$

Factors of $27=3\times 3\times 3$
Factors of $45=3\times 3\times 5$

Comman factors of both $27$ and $45$ which are less than $11$ are $3$ and $9$.

A composite number have factors other than 1 and itself.
Among them $3\&9$, composite number is $9$ because factors of $9$ are $1,3,9$.