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# 0 ounce piece of chocolate contains 15 {\rm mg} of caffeine, and a 6.0 ounce cup of regular coffee contains 105 {\rm mg} of caffeine.

A 1.0 ounce piece of chocolate contains 15 {rm mg} of caffeine, and a 6.0 ounce cup of regular coffee contains 105 {rm mg} of caffeine.How much chocolate would you have to consume to get as much caffeine as you would from 3.0 cups of coffee?