Question

the sum of two digits of a two digit number is is 7 when the digits are reversed then nber is decresed by 9 what is the number​

Answer 1

Answer:

the original no. is 43

Step-by-step explanation:

Let one's place digit be x.

ten's place digit be 7-x.

Original number=> 10(7-x)+x

=> 70-9x

Reverse number=> 10x+7-x

=> 9x+7

A.T.Q

70-9x - 9x-7=9

63-18x=9

18x=72

x=4

original number=43