solve question number 2
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unit digit-x
tens =10-x
no.=10(10-x)+x=100-9x
on reversing
no=10(x)+10-x=9x+10
acq
100-9x+36=9x+10
-9x-9x=100-36-10
-18x=54
=-3
tens =10-x
no.=10(10-x)+x=100-9x
on reversing
no=10(x)+10-x=9x+10
acq
100-9x+36=9x+10
-9x-9x=100-36-10
-18x=54
=-3
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