A number has 2 digits whose sum is 7. If 27 is added to the number it's digits get interchanged. Find the number
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Hi your answer is
let the two digits be 10x+y
the the inter changed digit is 10y+x
so
10x+y+27=10y+x
9(x+y)=-27
x-y=-3
x+y=7
2x=4
X=2
x+y=7
7-2=5
then number =52
let the two digits be 10x+y
the the inter changed digit is 10y+x
so
10x+y+27=10y+x
9(x+y)=-27
x-y=-3
x+y=7
2x=4
X=2
x+y=7
7-2=5
then number =52
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