Answer:
25 child tickets were sold on Monday.
Explanation:
Cost of ticket for a child = $5.10
Cost of ticket for an adult = $9.70
Let the number of child tickets sold be x.
Number of an adult tickets sold = 2x
Total sales on tickets = $612.50
![2x* \$9.70+x* \$5.10 =\$612.50](https://img.qammunity.org/2020/formulas/mathematics/middle-school/1kxjgldpombtcti5vatvjebokaybvi60ro.png)
![24.5x=612.5](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4e8y6m45taed92p90t48ppkw4pexwgxqsm.png)
![x=(612.5)/(24.5)=25](https://img.qammunity.org/2020/formulas/mathematics/middle-school/99ce9myita4n667pd5i30e9cb199mieoux.png)
25 child tickets were sold on Monday.