The sum of the digits of a 2-digits number is 7.If the digits are reversed the number formed is 9 less than the original number. Find the number.
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x+y=7........(1)
10y+x=10x+y-9
9x-9y=9
x-y=1........(2)
adding 1 and 2
2x=83
x=4
therfore y=3
no is 43
10y+x=10x+y-9
9x-9y=9
x-y=1........(2)
adding 1 and 2
2x=83
x=4
therfore y=3
no is 43
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