Question

The sum of the digits of a two-digit number is 15. If 9 is added to the number, the
digits are interchanged. Find the number.
​

Answer 1

Answer:

Answers is 78

solutions

Let the number on one's place be X

therefore , the number on ten's place be 15 - X

then, the number formed

= 10(15-x)+X

=150 -10x +X

150 - 9

The digit are interchange when 9 is added

therefore , the new number

= 10(X) + (15 -x )

= 10x+15- X

=9x +15

Now,

A/Q

= 150 -9x +9 = 9x + 15

= 159 -9x= 9x-15

= -9x -9x = -159 +15

= -18x =-144

= X = 8

therefore , the number become

= 150 -9x

= 150-9×8

= 150 -72

= 78 ans

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Answer 2

Answer

is

78 .Hope

it's

helpful

for

you

.please

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