Let's say Jack has X rendeers and Y snowbirds. So he needs X hats for rendeers and Y hats for snowbirds. And he needs 4X boot for rendeers and 2Y boots for snowbirds. He ordered 24 hats and 38 pairs of boots, which means X+Y = 24, and 4X + 2Y = 38*2. Solve two equations. You get X=14 and Y=10.
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