Give the step-by-step reasoning process and then the final answer. A snake's head is one-tenth its length. If a snake is 10 feet long, calculate the length of the rest of its body minus the head.
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A snake's head is one - tenth its length, which is 1 / 10 * 10 = 1 foot. Since the snake's head is 1 foot, the rest of its body is 10 - 1 = 9 feet long.
The final answer: 9.
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