divide 25 into two parts such that the sum of seven times the first part and five times the second part is 139
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Let one part be x.
The other part = (25 - x)
Sum = 7x + 5(25 - x) = 139
=> 7x + 125 - 5x = 139
=> 2x = 139 - 125 = 14
=> x = 7
=> 25 - x = 25 - 7 = 18.
Hence, the divisions are 7 and 18.
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