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The sum digits of the two-digit number is 17. The new number obtained by reversing the digits is 9 more than the original number find the number. |
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Answer» unit-y original NUMBER 10x+y interchange 10y+x x+y=17....1. 10x+y+9=10y+x 9x-9y=-9 x-y= -1 ....2 divided both SIDES with 9 adding 1 and 2 x+y=17 x-y=-1 2x=16 x=8 put x=8 in 1 8+y=17 y=9 |
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