In a two digit number, the digit at one place is four times the digit at ten places and sum of the digit is equal to 10, find the number.
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let xy be the digit
then x+y=10
and y=4x
then 5x=10(replacing y with 4x in x+y=10)
then x=2
so if x=2 then we get y=8
so the ans is 28
then x+y=10
and y=4x
then 5x=10(replacing y with 4x in x+y=10)
then x=2
so if x=2 then we get y=8
so the ans is 28
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