Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**princess****Member**- Registered: 2005-04-11
- Posts: 12

one more thing. I need help with the problems below:

The average of 2 and 4 is 3. what is the average of the reciprocals 2 and 4?

Offline

**princess****Member**- Registered: 2005-04-11
- Posts: 12

please help me, i have one of the most important math tests coming up and i really need help with my math. If i don't pass i'm going to be behind a year on math and my parents won't appreciate that.

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,560

The Reciprocals of 2 and 4 are 1/2 and 1/4

To average them, you have to add them together and divide by 2

Add them : 1/2 + 1/4 = 2/4 + 1/4 = 3/4

Then divide by 2: (3/4) / 2 = 3/8 DONE

Makes sense, really - what is half way between 1/2 and 1/4? 3/8

We don't have any worksheets on this, but we have other worksheets for you to practice on here

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

Offline

**princess****Member**- Registered: 2005-04-11
- Posts: 12

oh, i get it. it makes alot more sense then what my teacher told me. Thanks

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,560

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

Offline

**princess****Member**- Registered: 2005-04-11
- Posts: 12

i have a question again.

Offline

**princess****Member**- Registered: 2005-04-11
- Posts: 12

here is 1 of my math questions:

use a ratio box to solve this problem. In 25 minutes, 400 customers entered the attraction. At this rate, how many customers would enter the attraction in one hour?

please help!!

Offline

**princess****Member**- Registered: 2005-04-11
- Posts: 12

is any1 there?

Offline

**princess****Member**- Registered: 2005-04-11
- Posts: 12

look i know ur offline and i'm probally being pushy but when u get online u gotta answer me a.s.a.p. I'm desperate here. I NEED HELP!!!!!!

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,560

princess wrote:

use a ratio box to solve this problem. In 25 minutes, 400 customers entered the attraction. At this rate, how many customers would enter the attraction in one hour?

25 minutes 400 customers

60 minutes 960 customers

So, 25 is to 60 as 400 is to 960

Or another way of looking at it 25 x 2.4 = 60, so 400 x 2.4 = 960

Or, 25/60 = 400/960

Or ... anything like that

NOW, I am not sure what you have been taught anout "Ratio Boxes" - there can be more than one way to do them, so I hope this matches with what you have been taught.

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

Offline

**mathsyperson****Guest**

Answering to the puzzle, technically you could do 11+1+3+3+3=21.

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,560

mathsyperson wrote:

Answering to the puzzle, technically you could do 11+1+3+3+3=21.

That must be in response to:

j4tt wrote:

hi

i got a nice problem 4 you.

you got 12 numbers which are

1 1 1

3 3 3

5 5 5

7 7 7

how do you add any 6 numbers to make 21???

Remember no subtraction, division or multiplication and using only 6 numers not more not less..!!!!!!

Good one!

And before j4tt turns up and disagrees, I will say "You Are Right!"

Offline

**Roraborealis****Member**- Registered: 2005-03-17
- Posts: 1,594

I disagree.

School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

Offline

**Zach****Member**- Registered: 2005-03-23
- Posts: 2,075

I concur with whoever is right.

Boy let me tell you what:

I bet you didn't know it, but I'm a fiddle player too.

And if you'd care to take a dare, I'll make a bet with you.

Offline

**Roraborealis****Member**- Registered: 2005-03-17
- Posts: 1,594

I disagree because you cannot use 11.

School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

Offline

**Zach****Member**- Registered: 2005-03-23
- Posts: 2,075

Stop trying to steal my Limelight!

Boy let me tell you what:

I bet you didn't know it, but I'm a fiddle player too.

And if you'd care to take a dare, I'll make a bet with you.

Offline

**Roraborealis****Member**- Registered: 2005-03-17
- Posts: 1,594

Am I?

School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

Offline

**Mr T****Member**- Registered: 2005-03-30
- Posts: 1,012

why can't you use 11? 11 is a number

I come back stronger than a powered-up Pac-Man

I bought a large popcorn @ the cinema the other day, it was pretty big...some might even say it was "large

Fatboy Slim is a Legend

Offline

**Roraborealis****Member**- Registered: 2005-03-17
- Posts: 1,594

Any of the six numbers. 11 is not one of them.

School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

Offline

**princess****Member**- Registered: 2005-04-11
- Posts: 12

i have another problem again.

the question is:

collect the terms. x squared + 6x - 2x -12

i just don't understand it

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,560

Hi again, princess.

Easy peasy ... just neaten it up, so that "terms" such as x, or x-squared are brought together.

So, you have: x-squared + 6x - 2x - 12

There is just one "x-squared" term, so thats fine as it is

There are two "x" terms, so add them together: 6x - 2x = 4x

And there is just one normal number term (called a "constant"), ie, -12.

So the neatened-up expression is:

x-squared + 4x - 12 DONE

Offline

**Roraborealis****Member**- Registered: 2005-03-17
- Posts: 1,594

Oh, joy!

School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

Offline

**Mr T****Member**- Registered: 2005-03-30
- Posts: 1,012

yippee kay yay!!!

I come back stronger than a powered-up Pac-Man

I bought a large popcorn @ the cinema the other day, it was pretty big...some might even say it was "large

Fatboy Slim is a Legend

Offline

**stewie****Member**- Registered: 2005-03-28
- Posts: 820

Roraborealis wrote:

Oh, joy!

Dont steal my saying, u dont even know where its from

HAPPY HAPPY, JOY JOY

Fatboy Slim is the band of the 90s, thats if you want to call it a band because its really a one man name

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,560

Oh, Yeah, "Happy, Happy, Joy, Joy"

Offline