Tickets to a baseball game cost $3 for a child’s ticket and $5 for an adult ticket. at the last game, $521 was collected when 139 people attended the game. which value could replace x in the table so that a single-variable equation can be written and solved to determine the number of child’s tickets, c, sold?

x = 139-c is used to replace and there are 87 child's ticket.

Step-by-step explanation:

Let the number of child's ticket be 'c'.

Total number of people attended the game = 169

Let the number of adult's ticket be 'x'.

Cost of each child's ticket = $3.

Cost of each adult ticket = $5.

Total amount  collected = $521

So, According to question, it must be look like this :

3c+5x=$521

Here, we need to replace x , so that a single variable equation can be written and solved to determine the number of child's tickets sold.

x+c=139

x=139-c

So, our single variable equation becomes

3c+5(139-c)=$521

3c+695-5c=521

-2c=521-695

-2c=-174

Hence, x = 139-c is used to replace and there are 87 child's ticket.

it is 10.6 according to my calculations