31 ) In a 2-digit number
, the units place digitis x. If the sum of digits be 9 then
ne number is
9.
Answers
Answered by
1
Answer:
Units Place -- x
Tens Place -- x × 10= 10x
Sum of the digits -- 9
Therefore,
10x + x = 9
The equations so formed is this..
Answered by
0
unit digit = X
10 place = X + 9
original number= 10×x+ x+9
new number=10×(x+9)+x
ATQ
11x+9=11x+90
11x-11x=90-9
81
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