6in 20 people have red hair.

there are 1,000 people.

how many have red hair?
select one:
a. 300
b. 400
c. 200

This is a ratio question.
The original ratio is 6:20, which means 6 people with red hair for every 20 people.
When there are 1,000 people, that 20 turns into a 1,000.
x:1000 would be the new ratio, and the value of x is the answer.
Divide 1,000 by 20 then multiply that answer by 6 to get the answer.
This is because the same thing must be done to both sides, so whatever was multiplied by 20 to get 1,000 must be multiplied by 6 to get x for the ratios to be equivalent.
1000 / 20 = 50
50 • 6 = 300
x = 300
Original ratio: 6 red:20 total
New ratio: 300 red:1000 total

So when there are 1,000 people with a ratio of 6:20 people with red hair, there are 300 people that have red hair.

A. 300

Hope this helps!