Now this is odd... using the calculator on my computer I get 56. Using the calculator in my smart phone I get 50. Punched in the same on both, two different answers. Now I need to know why....
What was that I.D. whatever factor you were explaining the other day?
(Sorry, couldn't resist. Truth is I don't know. The consensus here seems to be that the answer is 56 but again, going to the internet where the problem is being worked a LOT, the answers are all over the place.)
See Aqua's solution for instance. . . . and I don't KNOW whether she is right or whether Montro is or the rest of us are. . . .
Don't know what I did different on my computer calculator the first time, but I get 50 now on that too, with or without using parentheses, and here it is on my smart phone calculator...
... I'd feel pretty safe saying the answer is 50.
Now HERE'S THE KICKER... if you hit "equal" after each number, you get 56. If you don't hit equal but type in the full equation then hit it, you get 50. It is all in how you work the equation. Frankly, I was taught to use a scientific calculator in college, and we were taught to enter an equation as it is written, in which case as this equation was presented, the correct answer would be 50, otherwise, if you are calculating in your head the number after each 7, the equation should then have been written completely different. For example, if it was written...
(7+7)÷(7+7)x(7-7)=
... then the answer is ZERO. It's all in how it's written, and how it's written determines how it's to be calculated. So...
7+7÷7+7x7-7=... entered that way as it is written into a calculator and then hit enter, the answer will be 50.
..