At a certain stand, all soft drinks cost the same and all sandwiches cost the same. How much does 1 sandwich cost at the

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At a certain stand, all soft drinks cost the same and all sandwiches cost the same. How much does 1 sandwich cost at the stand?

1) At the stand, 1 sandwich and 2 soft drinks cost a total of $3.15
2) At the stand, 3 sandwiches and 1 soft drink cost a total of $5.70

The OA is C