Question: ICIL U.4539 This problem is adapted from The Scholar's Guide to Arithmetic by Bonnycastle. If a cardinal can pray a soul out of purgatory, by

ICIL U.4539 This problem is adapted from "The Scholar's Guide to Arithmetic" by Bonnycastle. "If a cardinal can pray a soul out of purgatory, by himself, in an hour, a bishop in three hours, a priest in five, and a friar in seven, what is the minimum time it would take them to pray out three souls from purgatory, all praying together?"
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