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We need about six-seven people to complete the task.
It means roughly six or seven people are needed.
an approximate number between six and seven
The recipe calls for six-seven tablespoons of sugar.
This means you can use a little more or less than six tablespoons.
Used when an exact number isn't critical, often in measurements or counts.
Use this phrase when an exact number isn't necessary, often in casual conversation or instructions.
Combines the numbers six and seven to indicate approximation
Common in informal contexts where precision isn't required, such as cooking, measurements, or general estimates.