Math problem that is driving the Internet crazy

August 3, 2019 at 2:09 am
(This post was last modified: August 3, 2019 at 2:17 am by Grandizer.)
What is the correct answer to:

8 divided by 2(2+2)

Is it 1? Or is it 16?

At first, I said 1, but then I looked at it again and reckoned it's actually 16. But it could be 1, though ... huh?

Then I realized the trick here is that parenthesis, should we take care of that parenthesis first (and then have 1 as the answer), or should we treat it as a multiplication and hence the answer should be 16.

I think the answer has to be 16, but if so, then PEDMAS guideline would be a little misleading.

Ok, so here's why I think the answer is 16:

Before anything else, let's rephrase the problem a little so it's clearer what the answer should be later:

8 divided by 2 times (2 + 2)

First take care of parentheses:

8 divided by 2 times (4)

becomes

8 divided by 2 times 4

And then we have multiplication and division left, same level of precedence, so we start left to right

8 divided 2 = 4, and 4 times 4 = 16

8 divided by 2(2+2)

Is it 1? Or is it 16?

At first, I said 1, but then I looked at it again and reckoned it's actually 16. But it could be 1, though ... huh?

Then I realized the trick here is that parenthesis, should we take care of that parenthesis first (and then have 1 as the answer), or should we treat it as a multiplication and hence the answer should be 16.

I think the answer has to be 16, but if so, then PEDMAS guideline would be a little misleading.

Ok, so here's why I think the answer is 16:

Before anything else, let's rephrase the problem a little so it's clearer what the answer should be later:

8 divided by 2 times (2 + 2)

First take care of parentheses:

8 divided by 2 times (4)

becomes

8 divided by 2 times 4

And then we have multiplication and division left, same level of precedence, so we start left to right

8 divided 2 = 4, and 4 times 4 = 16

"Our attitudes towards things like race or gender operate on two levels. First of all, we have our conscious attitudes. This is what we choose to believe. These are our stated values, which we use to direct our behavior deliberately ... But the IAT [Implicit Association Test] measures something else. It measures our second level of attitude, our racial attitude on an unconscious level - the immediate, automatic associations that tumble out before we've even had time to think. We don't deliberately choose our unconscious attitudes. And ... we may not even be aware of them. The giant computer that is our unconscious silently crunches all the data it can from the experiences we've had, the people we've met, the lessons we've learned, the books we've read, the movies we've seen, and so on, and it forms an opinion." - Malcolm Gladwell