Question

number of two digits has 5 for its unit digit and the sum of its digit is 1/9 of the number interchange .what is the number?​

Answer 1

Answer:

45

Step-by-step explanation:

Since the sum of the digits (of the two digit number) is 1/9 of the number itself see the multiplication table of 9. 1×9=9; 2×9= 18; 3x9=27 ; 4×9=36; 5×9=45; 6×9=54; and so on . Since the unit digit is 5 the answer is 45.