सदस्य: Melody

marliani.majid:
the weight of the cat and mouse is 10kg, the weight of the dog and mouse is 20kg, the weight of the cat and dog is 24kg, what is the weight of the cat, dog and mouse?

Hi Marliani,

First you write the equations.
C+M=10 (1)
D+M=20 (2)
C+D=24 (3)

now make M the subject of equations1 and 2
Since you have M= as the Left Hand Side of t both of them, you can put the two right hand sides as equal to one another.
Now you can make D (or c) the subject of the new equation.

Now solve the new equation and equation 3 simultaneously to get the values of C and D
then sub back into one of the original equations to get the value of M.

See if you can do it now. Tell you what answer you get or tell me where you get stuck.
Melody.

Melody26 Des 2013

#29

+118690

Random260:
So typed in calculator wrong. Answer 806

500(1+(0.08/12))^ (6*12 )

Better still $806.75

Well,you actually left an important set of brackets out of the equation.
You put it into your calculator exactly as you wrote it so the real problem was that you wrote it down wrong.

Still, I think that you deserve a reward for getting it right.
I know that you are not a little kid, but I am!
kangaroo, frill neck lizzard and kookaburra.JPG

There is a couple of things I want to mention.
1.
(1+(0.08/12)) = (1+0.08/12) because you and the calculator both know that division is done before addition.
It doesn't matter that you have put the brackets in, I put the extra brackets in when I was showing you because I wanted to really stress the order.
Leave them in or take them out. It doesn't matter the answer is the same.

2.
Do you understand that your first answer was much too big and it basically had to be wrong? Would you like me to discuss this more. You might get a better feel for this sort of check as you do more examples. But maybe I can help you understand. It is up to you.

3.
Do you want another one or have you had enough now?

Cheers,
Melody.

Melody26 Des 2013

#27

+118690

Sorry, You'll have to try again.

Melody26 Des 2013

+118690

Max Giddings:
: What is the current population of the planet earth.

I think that you should Google it.
or look it up in whatever search engine that you use.
And then you should tell us what the answer is!

Have fun.

Melody26 Des 2013

+118690

bubacarr:
1(3536)kjbfkc568/*bdj

I know that this is a snark question. That is a new word that David taught me. But I'd be happy to play the game and answer it anyway.
but
I can't because you can't have a /* together like that. It doesn't make sense.

Melody26 Des 2013

#25

+118690

Random260:
Seems simple. R= 0.08/12 = 0.00666667
n= 12x6 =72
500(1+(0.08/12))^6*12 = 6244

----------------------------------------------------------------------------------------------------------
Okay random,
your r and n are correct. Good work.

Now think about your answer. You should always do that.
You invested 500 at 8%pa for 6 years.
Do you really think that you could end up with $6244. That's more than 12 times more than you started with or more than1200% what you started with.
does this seem right to you?? That is a serious question. If your serious answer is "I don't know" then I should talk with you more about that.

You put the numbers in the right places but you did do something wrong. Can you find your error?

Happy calculations
Melody.

Melody26 Des 2013

यूजर का नाम	Melody
स्कोर	118690
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