Mark and Peter dug ponds in their backyards. Mark’s pond is 4 feet deeper than 3 times Peter’s pond. If Mark’s pond is 19 feet deep, what is the depth of Peter’s pond? Think carefully first, then make a decision:
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Let’s use p for the number of feet in Mark’s pond. 3 * p + 4 = 19. 3 * p = 19 - 4 = 15. 3p = 15. p = 5. So, the answer is 5.
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