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There are three numbers on a list. The first number is twice the second number; and the second number is three times
the third number. if the sum of the three numbers is 108; what are the three numbers?
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Let x be the 3-rd number.
Then the 2-nd number is 3x.
Then the 1-st number is 2*(3x) = 6x.
The sum of the three is x + 3x + 6x = 10x.
The equation is 10x = 108.
Find x.