Total amount collected from an officer for a charity cause was $\$250.$ If each employee contributed either $\$20$

Total amount collected from an officer for a charity cause was $\$250.$ If each employee contributed either $\$20$ or $\$25,$ how many employees contributed $\$20?$

1. The number of employees in the office is $11$
2. The number of employees who gave $\$25$ was $1$ more than the number of employees who gave $\$20$

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