How to do this problem?

A chemist mixes a 10% saline solution with a 20% saline solution to make 500 ml. of a 16% saline

solution. How many ml of each solution does the chemist mix together?

I know how to do it just getting the wrong answer sadly.

can you show me how you would do it with steps.

Update:

the awnser should be

The chemist should use 200 ml of 10% saline solution and 300 ml

of 20% saline solution to make 500 ml of 16% saline solution.

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