20:2

Simplifies to 10:1.

Reason: gcd(20, 2) = 2, so (20 ÷ 2):(2 ÷ 2) = 10:1.

Other representations:

• as a single value: 20/2 = 10
• decimal: 10.0
• if scaling: (20x):(2x) for any x; the smallest form is 10:1.