Answer: C. Twenty-four is 40% of what number
Explanation:
Let the answer in each question is x,
Then in A) What is 40% of 24
In B) What percent is 24 of 40,
In C) Twenty-four is 40% of what number
In D) Forty percent of 24 is what number,
Thus, in problem C the given expression will use.
I believe the answer is 3
I took it, and assuming I'm reading your question right, it's D: an=2/3*9^n-1