The digit of a two digit number differ by 3. If the digits are interchanged and the two numbers added their sum is 77. Find the numbers.
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tens digit=x
unit digit=x-3
first no.=10x+x-3 =11x-3
on interchanging no.=10(x-3)+x =11x-30
11x-3+11x-30=77
22x-33=77
22x = 110
x=5
unit digit=5-3 =2
tens digit =5
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