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A new mixture of self-tanning developed. This mixture is made by mixing 700 ounces of everyday moisturizing lotion for $0.7 ounce with self-tanning lotion worth $4 per ounce. If the new self-tanning & moisturizing lotion mixture is to cost $1.90 per ounce, how many ounces of the self-tanning lotion in the mixture?​