Please show me how to solve this word problem:
There are 66 books in the Bible and 39 of these books are in the old testament. What percent of the Bible comprises new testament books?

Have you read your textbook... because this is extremely basic... and extremely simple.

You start by looking for the unknown quantity...then calculate the percentage of those of what you have been given.

OH PULLEZZ. Simple math. 66-39= X. X/66=? Convert to%