Math word problems are my struggle.

Question

At the city museum, child admission is $5.20

 and adult admission is $8.90

. On Saturday, twice as many adult tickets as child tickets were sold, for a total sales of $690.00

. How many child tickets were sold that day?

Answer 1

A=2C

5.2C + 8.9A = 690

5.2C +8.9(2C) = 690

5.2C + 17.8C = 690

23C = 690

C = 690/23

C = 30 Children

A=2C=2(30) = 60 Adults

5.2(30) + 8.9(60)

= 156+534=690