To find the ratio of 3 weeks to 21 days, the key is to express both time periods in the same unit. Since 1 week = 7 days, we convert:
“
3 × 7 = 21 days
Now the ratio becomes:
21 days : 21 days = 1 : 1
This shows that both durations represent exactly the same amount of time.
A simple way to understand this is to compare it with everyday planning. For example, when someone checks what date it will be 21 days from today, they are essentially checking 3 weeks ahead.
This helps explain why the ratio simplifies to 1 : 1 — because both time durations match perfectly.
Example Table for Better Understanding
| Time Duration | Converted Value | Final Ratio Compared to 21 Days |
|---|---|---|
| 3 weeks | 21 days | 1 : 1 |
| 1 week | 7 days | 7 : 21 = 1 : 3 |
| 2 weeks | 14 days | 14 : 21 = 2 : 3 |
| 4 weeks | 28 days | 28 : 21 = 4 : 3 |
