Update Sum Mixed Array.md

8 kyu/Sum Mixed Array/Sum Mixed Array.md

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 # 8 kyu - Sum Mixed Array - Authored by PG1
 
 Link to kata: https://www.codewars.com/kata/57eaeb9578748ff92a000009
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+Given an array of integers as strings and numbers, return the sum of the array values as if all were numbers.
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+Return your answer as a number.