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To find the number of hours Heather would have to work to make 153 at the same rate, we can set up a proportion:
204/12 = 153/x
Cross-multiplying: 204x = 12 * 153
Dividing both sides by 204: x = (12 * 153)/204
Simplifying: x = 9
Therefore, Heather would have to work 9 hours to make 153.