A sperms whale can stay under water 7 times as long as X minutes more than a platypus can. Write an equation that states the relationship of the minutes these two mammals can stay under water.
Sperm whale - 112
Platypus - 10

Did I solve the problem right?

1. Platypus: 10 min.
Whale: 7(10+x) = 112

posted by Henry

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