1.

The sum of the digit of a two digit number is 15 and if 19 is added to the number the digits are interchanged. find the number.​

Answer»

Step-by-step explanation:

let the one's digit be x

and the tens digit = (15 - x )

original number = 10 (15 - x )+ x

150 - 10 x +x

150 - 9x

On INTERCHANGING = 10X + (15-x)

10x + 15- x

9x + 15

A/Q

original number + 19 = interchanged number

150 - 9x + 19 = 9x + 15

150 + 19 - 15 = 9x + 9x

154 = 18 x

x = 8

now 10 th place = 15 - 8

= 7

therefore digit is 78

HOPE IT HELPS YOU!



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