Question

the digit at units place of a two digit number is one more the digit at the tens place.if 9 is added to the number the digits get interchanged.find the number​

Answer 1

Answer:

1&10, 12 & 21, 23&32, 34&43, 45&54, 56&65, 67&76, 78&87, 89&98

Step-by-step explanation:

let tenth place digit be x

then unit place digit is x+1

by condition

10x+x+1+9=10(x+1)+x

11x+10=11x+10

as both sides are equal, x can have any value

but it's should be 0 to 9 as it is only two digit

now if x=9 other number should be 10 which can't be possible so many pairs are possible