Question

If 6 out of 30 people over the age of 100 are male how many are female

Answer 1

Answer: 20

Work:
Here, you could make a proportion. 

 6      x
---- x ----
30    100 

6 * 100 = 600
30 * x = 30x

600 / 30 = 20

Answer 2

Hi!

So we know that there are 30 people over 100, and 6 of them are male. That means the the rest are female. We just have to find out how much the rest is. 

To do that, we subtract
30-6 = 24

The answer is 24.

Hope this helps! :)