Maths questions help

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#1
Can someone help me with this question as it is due tmrw and i have no clue how to attempt it and get the answer.
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#2
This one
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7 months ago
#3
Hmm..I think ive done that question before
Last edited by username5205898; 7 months ago
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7 months ago
#4
😴😴
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7 months ago
#5
Find expressions for the chance of picking a red ball from each one of the bags after two blue balls have been taken from one bag and placed into the other.
Remember that the chance of picking a red ball from each of these bags is the same, so equate the expressions to each other.
What you have written down is correct so far, keep going!
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#6
(Original post by jamiecjx)
Find expressions for the chance of picking a red ball from each one of the bags after two blue balls have been taken from one bag and placed into the other.
Remember that the chance of picking a red ball from each of these bags is the same, so equate the expressions to each other.
What you have written down is correct so far, keep going!
So 30/n+2 = n/12
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7 months ago
#7
(Original post by samin101)
So 30/n+2 = n/12
Remember the probability is , you just did

You should end up with something like this (hidden in spoiler so you can check)

Spoiler:
Show
Last edited by jamiecjx; 7 months ago
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#8
(Original post by jamiecjx)
Remember the probability is , you just did
So 30/n+32 = n/n+12
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#9
(Original post by jamiecjx)
Remember the probability is , you just did

You should end up with something like this (hidden in spoiler so you can check)

Spoiler:
Show
So what should i do next? Im really bad at maths 😂
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7 months ago
#10
(Original post by samin101)
So 30/n+32 = n/n+12
Yep now solve for n, start by getting rid of the fractions. Multiply both sides by (n+32) and (n+12)

Something like this should come out of it.
Spoiler:
Show

You will end up with a quadratic equation, which has two answers. One of these answers will not make any sense, and will be discarded.
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#11
(Original post by jamiecjx)
Yep now solve for n, start by getting rid of the fractions. Multiply both sides by (n+32) and (n+12)

Something like this should come out of it.
Spoiler:
Show

You will end up with a quadratic equation, which has two answers. One of these answers will not make any sense, and will be discarded.
So n^2+2n-360=0 but then you cannot factorise them
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7 months ago
#12
(Original post by samin101)
So n^2+2n-360=0 but then you cannot factorise them
You can actually factorise it, but if you can't think of a way, just use the quadratic formula to find the solutions.

Spoiler:
Show

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#13
(Original post by jamiecjx)
You can actually factorise it, but if you can't think of a way, just use the quadratic formula to find the solutions.

Spoiler:
Show

[tex]n=18\ or\ -20[/text
Thank you so much. You have been such a great help
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7 months ago
#14
(Original post by samin101)
Thank you so much. You have been such a great help
My pleasure
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#15
(Original post by jamiecjx)
My pleasure
Could you help with this question?
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7 months ago
#16
(Original post by samin101)
Could you help with this question?
So for this question there are a lot of approaches you could do.
ngl, I don't really know what you wrote down here, so Imma just start again.

For convenience, call and

The hint tells you to set up two equations. Find ways to express the two statements in terms of x and y. Remember
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