421:3

Do you mean:

• 421 ÷ 3 (division): 421/3 = 140 with remainder 1 → 140.333... (or 140 1/3)
• The ratio 421:3: simplifies to 421:3 (already in simplest form), which is the same as 421/3 ≈ 140.333...

If you share the exact context (division problem, ratio, or a proportion), I’ll tailor the steps.