If 12 more than a number is added to the number, and three times the number is subtracted, the result is the original number. What is the original number?

I have a problem with dry erase markers disappearing from my classroom. A third of my markers were stolen by a student, and then one of my co-workers "borrowed" four markers. After that I realized that half of the remaining markers didn't work, so I threw them away.

In the end, I just had two markers left.

How many did I start with?

I have a sheet of paper with three integers written on it. If I add them together, I have a sum of 38.

Two of the numbers differ by one. One of the three numbers is 11.

What is the largest possible integer that could be written on the paper?

I'm thinking of three numbers. The second number is fourteen more than the first number, and the third number is twice the second number. If the first number is subtracted from the third, the result is 44. What is the third number?

Next year, Martha will be three times as old as she was 17 years ago. How old is Martha now?

Nathan started at the bottom of the stairs and climbed n steps. After that he went down n - 4 steps, and was then 15 steps from the top of the stairs. How many steps are there?

A number, plus 5 more than that number, plus twice the sum of 5 and that number, is 43. What is the number?

The number of seconds until New Years Day (when the ball drops at Midnight) is equal to the number of hours since the last time the ball dropped. Assuming a non-leap-year, what is the current date and time, to the nearest minute?

The height of a building measured in feet is 196 more than its height measured in yards. What is the height of the building in feet?

Two more than twice the sum of x and five is equal to twelve less than three times the sum of x and two.