If Mary has nine red chewy candies, and the pack contains twice as many red chewy candies as Mary has, you can calculate the total number of candies in the pack by multiplying the number of candies Mary has by two.
So, the calculation would be:
\[ 9 \text{ (candies Mary has)} \times 2 = 18 \text{ (candies in the pack)} \]
Therefore, there are 18 red chewy candies in the pack.
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