if ten digit of a two digit number is 9 and unit digit y , then two digit number is
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Let the two digits number is xy.
Here, Unit Digit = y and Tenth Digit = x
Given x + y = 9 ——————— ( 1 )
and y = x/2
=> 2 y = x ——————— ( 2 )
Substituting value of “ x “ in equation ( 1 ), we have
2 y + y = 9
=> 3 y = 9
=> y = 9 / 3
=> y = 3
=> x = 2 y
Substituting value of “ y “ in equation ( 2 ), we have
=> x = 2 y
=> x = 2 ( 3 )
=> x = 6
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