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19-10-2016
Mathematics

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The tens digit of a two digit number excedds the unit digit by 5 . if they are reversed b the new number is less by 45. if the v sum of their digits is 9 find the numbers

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25-10-2016

x and y are digts
x is tens y is ones

x=y+5

10y+x=10x+y-45
x+y=9

we have
x+y=9
x=y+5
sub
y+5+y=9
2y+5=9
minus 5
2y=4
divide 2
y=2

sub back
x=y+5
x=2+5
x=7

the number is 72

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