HELP PLEASE

Question

At the city museum, child admission is $6.50 and adult admission is $9.80. On Saturday, twice as many adult tickets as child tickets were sold, for a total sales of $626.40. How many child tickets were sold that day?

Answer 1

c represents the number of childrens

2c represents the number of adults

 

6.50c + 9.80(2c) = 626.40

 

Can you solve for c and answer?