Karl Schwartz has total travel expenses of $643. His transportation cost is $290, the lodging cost is $198, and additional costs are $80. If dinner costs twice as much as lunch, how much is his lunch?

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1. Karl Schwartz has total travel expenses of $643. His transportation cost is $290, the lodging cost is $198, and additional costs are $80. If dinner costs twice as much as lunch, how much is his lunch?