a number consists of two digits whose sum is 8 if 18 is added to the number its digits are reversed find the number
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x+y=8( 1 equation)
10x+y+18=10y+x
9x-9y+= -18
x-y= -2 (2 equation)
x=3
y=5
the number=10x+y
=10×3+5
=35
10x+y+18=10y+x
9x-9y+= -18
x-y= -2 (2 equation)
x=3
y=5
the number=10x+y
=10×3+5
=35
but its answer at back of my book is 35
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