The correct translation is 'Tienen tantas camisas como nosotros.' It matches the quantity and gender of the shirts in Spanish.
Tienen tantas camisas como nosotros.
In this case, 'tantas' is the correct form to agree with 'camisas' (shirts) as a plural feminine noun, matching the English 'as many shirts'.
It's important in Spanish to match the quantity with the appropriate form of 'tantos' (masculine) or 'tantas' (feminine) based on the noun being referred to.
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