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Questions (1)
In a positive number of two digits, the sum of the digits is 15. If the digits are interchanged, the number is increased by 9.
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Answers (1)
Let 6y-2x+1=4y ——(1) for 2 equal length And let 4y+6y-2x+1+x+2y=28 ——(2) for the perimeter of triangle Now from equation (1) 6y-2x+1=4y 6y-4y=2x-1 2y=2x-1 y=(2x-1)/2 Also from equation (2) 4y+6y-2x+1+x+2y=28 12y-x=27 ——(3) Substitute y in
