How do I calculate average? and What does per 100 word mean?

Question

- 295 letter(s) - 70 word(s) - 3 sentence(s)

How do I calculate ?

1. Average number of letters per 100 words.
2. Average number of sentences per 100 words.

I know that:

Average = total value / No. of value

SO, Average letters = 295 / words ? is that how we do it? what about per 100 words? Can someone explain it to me?

(PS I am not good at maths. Thankyou for your time.)

Answer 1

Average letters per words=295/70=4.21 Average letters per 100 words=421. average sentences per words=3/70=0.0428 average sentences per 100 words=4.28