Answers

2014-11-04T18:26:25+05:30
10x+y+36=10y+x
9x+36=9y
x+4=y
now
xy=12
x(x+4)=12
x=-6 and 2
but x cannot -6 as it is negatie
so 
x=2 and
y=6
ans
required number is 26

0
2014-11-04T18:45:11+05:30
So let the two digits be x and y 
so xy = 12
so 10x+y+36 = 10y+x
9y-9x= 36
y-x = 4
y = 4 + x 
so 
xy = 12 
x(4+x)= 12
x² + 4x - 12 = 0
x² +6x - 2x - 12 = 0
x(x+6)-2(x+6) = 0
  

so x  = -6 or 2 
so x can't be negative x = 2

so y = 4 + 2 = 6

so the number is 26
0