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Define the numbers:
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Let x be one number.
One number = x
Other number = 5x
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Construct the equation:
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5x - x = 80
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Combine like terms:
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4x = 80
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Divide by 4 on both sides:
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x = 20
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Find the 2 numbers:
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One number = x = 20
Other number = 5x = 5(20) = 100
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Answer: The two numbers in increasing order are 20 and 100.
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