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

You are not logged in.

#926 2013-03-30 01:30:37

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

hi bobbym  mandy here do you now how to do ratio or not?

Offline

#927 2013-03-30 01:35:16

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,665

Re: Mandy Jane's Corner

Hi Mandy;

Yes, I do but you already have a person helping you. If I interfere it might just confuse you. You see everybody has different ways of doing things. When you are learning you should not see too many different ways.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Offline

#928 2013-03-30 01:38:48

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

Hi bobbym mandy here thanks for your help it was helpful

Offline

#929 2013-03-30 01:44:32

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

Hi steveb mandy here.3 to 7 ratio scale it up to 100 tins

New total 100
               ----
Old total.   10. ( come from 3+7 )

So scaling factor = 100/10 = 10

I get this far then I get stuck?

Can you show me how to do the rest please?

Offline

#930 2013-03-30 04:18:22

SteveB
Member
Registered: 2013-03-07
Posts: 557

Re: Mandy Jane's Corner

The bit that you have done is correct. I was intending that you would then multiply this scaling factor by the two numbers in the ratio.

So   3 x 10 = 30
and  7 x 10 = 70

So for 100 tins you would have 30 yellow and 70 blue. A quick check would be 30 + 70 = 100 to see that it adds up to 100.
If percentages are needed then they would be 30% yellow and 70% blue.

Can you see what the answer would be for a total of only 50 tins of paint?

Offline

#931 2013-03-30 04:28:55

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

hi steveb the answer to 50 tins is

new total 50
              ----
old total   10

so scaling factor = 50/10 = 5

so 3 x 5 = 15
and 7 x 5 = 35
so for every 50 tins you would have 15 yellow and 35 blue

am i right?

Offline

#932 2013-03-30 04:40:13

SteveB
Member
Registered: 2013-03-07
Posts: 557

Re: Mandy Jane's Corner

Yes that is correct. Well done.

Offline

#933 2013-03-30 04:41:31

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

now what do you want me to do then?

Offline

#934 2013-03-30 04:44:16

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

hi bob bundy mandy here how do you think i am doing then? send message back please?

Offline

#935 2013-03-30 04:45:04

SteveB
Member
Registered: 2013-03-07
Posts: 557

Re: Mandy Jane's Corner

Right. With that same ratio of 3:7 what would the answer be for a total of 70 tins ?

Offline

#936 2013-03-30 04:50:18

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

is it the same as last on or not

Offline

#937 2013-03-30 04:51:51

SteveB
Member
Registered: 2013-03-07
Posts: 557

Re: Mandy Jane's Corner

The ratio is the same, but the total is different.

Offline

#938 2013-03-30 04:54:43

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

i am stuck on this one HELP ME?

Offline

#939 2013-03-30 04:56:19

SteveB
Member
Registered: 2013-03-07
Posts: 557

Re: Mandy Jane's Corner

Right. The thing that I am calling an old total is the same (3 + 7 = 10). However I have given you a different number for the
new total. The new total is 70. What is the scaling factor in this case ?

Offline

#940 2013-03-30 05:01:51

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

new 70
      ----
old   10

so scaling factor = 70/10 = 10
so 3 x 10 = 30
and 7 x 10 = 70

am i right so far ? i am stuck

Offline

#941 2013-03-30 05:02:57

SteveB
Member
Registered: 2013-03-07
Posts: 557

Re: Mandy Jane's Corner

No. You need to look back at the scaling factor bit. The answer to 70/10  is not 10.

Offline

#942 2013-03-30 05:05:32

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

is it 5 am i right?

Offline

#943 2013-03-30 05:07:55

SteveB
Member
Registered: 2013-03-07
Posts: 557

Re: Mandy Jane's Corner

No that is not correct. I think this is a times tables problem. 5 x 10 = 50 and 10 x 10 = 100 somewhere inbetween these two
guesses lies the answer. I don't want to simply tell you the answer because this is good practice for you.
Do you want to try again?

Last edited by SteveB (2013-03-30 05:08:47)

Offline

#944 2013-03-30 05:11:33

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

i will try again and send you my answer at 7.30pm tonight ok see you then buy for now?

Offline

#945 2013-03-30 05:11:49

SteveB
Member
Registered: 2013-03-07
Posts: 557

Re: Mandy Jane's Corner

Okay see you later.

Offline

#946 2013-03-30 07:35:41

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

Hi steveb mandy here i have tried to do that sum again but I can not work it out? Can you help me please?

Offline

#947 2013-03-30 07:40:21

SteveB
Member
Registered: 2013-03-07
Posts: 557

Re: Mandy Jane's Corner

There are two things here that you need to revise possibly:
(1) Times tables
(2) Division by 10 (and for that matter multiplying by 10)

70 divided by 10 is 7 

Each time you have a multiplication in the form: a x b = c
This means that  c / a = b
and also c / b = a
(We do need to take care to avoid divisions by zero here, but that is another story)

So here  7 x 10 = 70       70 / 10 = 7       70 / 7 = 10

Offline

#948 2013-03-30 07:45:10

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

Hi steveb mandy here i am still a bit confused with these need more practices ok? Send me some to try please?

Offline

#949 2013-03-30 07:46:02

SteveB
Member
Registered: 2013-03-07
Posts: 557

Re: Mandy Jane's Corner

Right let us try to finish off the question about the 70 tins of paint and how many we need of each colour.

So the scaling factor is 7. Can you finish the question off ?

Offline

#950 2013-03-30 07:54:14

mandy jane
Member
Registered: 2010-09-23
Posts: 1,003

Re: Mandy Jane's Corner

I am still doing will be back soon with answer

Offline

Board footer

Powered by FluxBB