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Half of a number and nine is 15.

Increasing a number by five and then doubling the outcome is the same as decreasing the number by twelve.

Gail, Gus, Greg, Gordon and Gabby each had a guppy that had babies. Gail's guppy had 16 babies. Gus' guppy had 11 less babies than Gordon's. Greg's guppy had 15 less babies than Gabby's and 3 more than Gus'. Gabby's guppy had 3 dozen babies. How many babies did each...