Ok Math Wizards, settle what's becoming a much bigger disagreement than it should be.

[Barn Babe]

Originally Posted by Cybercowboy

Could you tell us how you came up with the answer 320?

4x4=16
16+4=20
20x4=80
80+4=84
84-4=80
80x4=320

Tada!

[Cybercowboy]

Originally Posted by Barn Babe

4x4=16
16+4=20
20x4=80
80+4=84
84-4=80
80x4=320

Tada!

Except the order of operation in mathematical operators (for the one's present) is multiplication/division first, addition/subtraction second. Therefore you need to do all multiplication first, as I did in my example, then add/subtract the result. This is pretty important.

[Barn Babe]

Originally Posted by Cybercowboy

Except the order of operation in mathematical operators (for the one's present) is multiplication/division first, addition/subtraction second. Therefore you need to do all multiplication first, as I did in my example, then add/subtract the result. This is pretty important.

So there's 2 ways to do it. This is why I HATE HATE HATE math!

[Cybercowboy]

Originally Posted by Y-Body

117 = 79

IF 10's digit on right is same as 1's digit on left and 1's digit on right is sum of digits on left

BUT

117 = 69

IF both are mapped as constant increments from a given initial value.

Ummm, no, wait ...

No matter how you twist it around, the left column increments by one while the right column increments by 11. Nothing else matters. It's just that simple.

Here, I'll put it this way. If I show the following two sequences:

111, 112, 113, 114, 115, ...

and

13, 24, 35, 46, 57, ...

Then asked you "For the following two sequences, give the next two terms for each."

The correct answer, and the only possible correct answer, would be "116, 117 and 68, 79."

[Cybercowboy]

Originally Posted by Barn Babe

So there's 2 ways to do it. This is why I HATE HATE HATE math!

No, there are not two ways. The order of operations settle that question, no ifs, ands, or butts.

The full list of http://en.wikipedia.org/wiki/Order_of_operations are:

1. exponents and roots
2. multiplication and division
3. addition and subtraction

[Barn Babe]

Originally Posted by Cybercowboy

No, there are not two ways. The order of operations settle that question, no ifs, ands, or butts.

The full list of Order of operations - Wikipedia, the free encyclopedia are:

1. exponents and roots
2. multiplication and division
3. addition and subtraction

Unless, you have a family of 4 who each want 4 eggs. then another member comes along who also wants 4 eggs. The neighbors hear you're making breakfast and 4 of them come over. Then the single lady across the street joins you. This causes the husband of your neighbor to leave. Then all of these people decide they want 4 extra eggs.

[Cybercowboy]

Originally Posted by Barn Babe

Unless, you have a family of 4 who each want 4 eggs. then another member comes along who also wants 4 eggs. The neighbors hear you're making breakfast and 4 of them come over. Then the single lady across the street joins you. This causes the husband of your neighbor to leave. Then all of these people decide they want 4 extra eggs.

Then you are, in essence, introducing parenthesis to the original formula. When the parenthesis aren't present the order of operations takes precedence. You can't just do that at random.

[Thunder22]

Originally Posted by Barn Babe

111 = 13
112 = 24
113 = 35
114 = 46
115 = 57
117 = ?

I say 117 = 69, Jon says it's 79. What say teh Barn?

Assuming 116=68 then 117=79

[Y-Body]

Originally Posted by Cybercowboy

No matter how you twist it around, the left column increments by one while the right column increments by 11. . . .

Or, phrased more generally, "...both are mapped as constant increments from a given initial value. ..."

[Cybercowboy]

Originally Posted by Y-Body

Or, phrased more generally, "...both are mapped as constant increments from a given initial value. ..."

Yeah, I wasn't picking on you in particular, just used your post to make it perhaps a bit clearer for the others. The mistake many people make in these sorts of questions is trying to relate each pair in the two sequences (the equal sign) instead of simply viewing the two sequences as separate entities to begin with, with the equal sign only signifying the relative position in each sequence.

Now if the there was indeed a relationship between the two sequences, a dependency, beyond position then one would see that each sequence, by itself, made no sense.

Example:

00 = 0
10 = 1
12 = 3
22 = 4
24 = 6
34 = 7

What is the next value in each column?

[Mike Mercury]

Originally Posted by Cybercowboy

No it's not!

(4x4)+(4x4)+4-(4x4) = (16)+(16)+4-(16) = 20

Period.

you added brackets; making it a parallel equation.

But it is written as a series equation.

period.

[Sea Six]

Originally Posted by Barn Babe

So there's 2 ways to do it. This is why I HATE HATE HATE math!

Yes. Yes, there are.

There are two ways to do it.



1. The right way
2. The manner that eschews the order of operations.

[Cybercowboy]

Originally Posted by Mike Mercury

you added brackets; making it a parallel equation.

But it is written as a series equation.

period.

Um, no.

http://en.wikipedia.org/wiki/Order_of_operations

For example, in mathematics and most computer languages multiplication is done before addition; in the expression 2 + 3 × 4, the answer is 14. Brackets, "( and ), { and }, or [ and ]", which have their own rules, may be used to avoid confusion, thus the preceding expression may also be rendered 2 + (3 × 4), but the brackets are unnecessary as multiplication still has precedence without them.

[Cybercowboy]

Originally Posted by Sea Six

Yes. Yes, there are.

There are two ways to do it.



1. The right way
2. The manner that eschews the order of operations.

In every mathematical question there are two ways of working it.

1. The way that yields the right answer.
2. The infinite other ways that yield the wrong answer.

[Sea Six]

Please Excuse My Dear Aunt Sally describes the order of operations.

P and E represent parentheses and exponents, which must be solved first. They are absent in the problem Mike posed.

My Dear represents multiplication and division. Using the order of operations, one must solve only those such operations next, individually.

Aunt Sally represents addition and subtraction, which are performed last.

[Bucwheat]

Following the current pattern= 68

[Cybercowboy]

Originally Posted by Bucwheat

Following the current pattern= 68

[Will]

This thread gave the sexist in me a hearty chuckle.

Thanks!

[Mike Mercury]

Originally Posted by Cybercowboy

Um, no.

Order of operations - Wikipedia, the free encyclopedia

but doing it your way... you'd be dividing by zero; and that's a no-no.

[BuckyThreadkiller]

Originally Posted by Mike Mercury

but doing it your way... you'd be dividing by zero; and that's a no-no.

I flunked Algebra every time I took it, but I know the answer is 20.

There is no such thing as a "series equation." Order of operations is what makes everything work and provide the same, correct answer.