Answer :
As given by the question
There are given that the a number is n
Now,
According to the given statement:
Number n is added to 15
That means:
[tex]15+n[/tex]Then,
Number n is added to 15 less than 3 times itself and the result is 101.
That means:
[tex]3n-15+n=101[/tex]Hence, the correct option is A