If a:b:c:d = 5:9:20:18, then c:a will be _____?

If a:b:c:d = 5:9:20:18, then c:a will be _____?

Explanation

To find the ratio c:a, divide the value of c by the value of a:

c:a = 20:5

Simplify the ratio by dividing both numbers by 5:

c:a = 4:1