Question

40 people or 10% of a group of people were aged 55 or older how many people were younger than 55 in that group?

Answer 1

Answer: 360

Explanation:

If 10% of people were 55 or older, than 90% of people were younger than 55.

This is 9 times the number of people that were 55 or older.

Therefore, the answer is 360.