Selma, Karen and Jess are training for a marathon. Each week Selma runs 3 times more than Jess. Jess runs half the amount of Karen. How many miles does Selma run if Karen runs 12 miles a week?
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If Karen runs 12 miles then Jess runs 6 miles. Selma runs 3 times more than Jess so she runs 18 miles.