Let us consider a two digit number. If the digits are interchanged, the new number is 9 more than the original number. The second digit of the original number is one more than the first digit. Find the number.
Let x be the first digit and y be the second digit
(10y + x) - (10x +y) = 9
and...
I just started taking geometry and discrete math and we're just learning 2d matrices. Here is a problem I can't figure out:
1) My wife and I are 6 years apart in age. If you double the sum of our ages and add 50, you get the same number as when you add 25 to the sum of our ages and double it...
It's a bit of both, dreaming of new ideas for the future can help develop them. However there are too many unpredictable changes that people don't take into account.