Question

A number consisting of two digits is 7 times the sum of its digits. When 27 is subtracted
the number the digits are reverse. Find the number
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Answer 1

xy=7(x+y)

so, when no is subtacted with27 it is reversed

so,x=6 , y=3

63=7(6+3)

=63

when 63 is subtracted with 27 it gives 36 which is reverse of 63