20:2

10:1

Reason: gcd(20, 2) = 2, divide both parts by 2 → 20:2 = 10:1.

Extras (if helpful):

• As a decimal, this ratio corresponds to 10.
• If you want parts of a whole (total 22), the first part is 20/22 = 10/11 and the second part is 2/22 = 1/11.