Every day we will share one Math question. You can solve it and share your solution in the comments below. The next day, we will post the method of solving today’s question and answer any of your subsequent questions in the process. Click on the post, read the question and share your answer. Today’s question is on System of Linear equation.

If the two digit’s sum is 11, then it should be only the following numbers:

92

83

74

65

56

47

38

29.

The reverse of these numbers should be greater than 45, so it can be only:

29=92

38=83

47=74

56=65

65=56

74=47

After this it is going to be less than 45,so even if we are going to do it one by one, we get:

92=9+2=11

83=8+3=11

74=7+4=11

65=6+5=11

56=5+6=11

47=4+7=11

They all come to 11.

This also proves that addition is commutative

Original number is 38, sum of original number & second number 38+83=121