Answer: a) 
b) 30
Step-by-step explanation:
Given: The number of new songs that a rock group needs to stay at the top each year is inversely proportional to the year and that the group has been in the industry.
Let x be the number of songs will be needed after 5 years.
Now the inverse variation equation for the given question will be:-

Hence , the number songs will be needed after 5 years = 30
If the 3 is supposed to be replaced by any x's, then the answer would be 29 I believe.