At the city museum, child admission is $5.20 and adult admission is $9.90 . on monday, twice as many adult tickets as child tickets were sold, for a total sales of $900.00 . how many child tickets were sold that day?

To solve this, I would just find what two adult tickets and one child ticket wold be worth.

To find that, just do:

5.20 + 9.90 * 2, which makes 25.

So now you just find how many 25s are in 900, or 36.

So 36 children's tickets were sold that day.

Hope I helped :)

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