Maths, Addmaths and Statistics: Post your doubts here!

[HarisShahzad]

Re: O'level Maths, Addmaths and Statistics help available he

1/p + 1/q = q+p/pq

q+p/pq=7/12

q+p=7 p=7-p

pq=12
substituting

(7-q)q=12

7q-q^2=12

q^2-7q+12=0

solve to obtain 3 and 4.
then substitute q values into 7-q=p to obtain values 4 and 3

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

Thanks.
The question had two correct responses. Either p and q are 3 and 4 or they have the values 2 and 12. I wonder if there's a way to get the latter answer, too.

 

[HarisShahzad]

Re: O'level Maths, Addmaths and Statistics help available he

Thanks.
The question had two correct responses. Either p and q are 3 and 4 or they have the values 2 and 12. I wonder if there's a way to get the latter answer, too.

ur right bro and really got me thinking. personally i think the only way to get 2 and 12 is through trial and error, i might be wrong though so ill keep thinking.

 

[SalmanPakRocks]

Re: O'level Maths, Addmaths and Statistics help available he

I found the inverse of 2x-1 ((x+1)/2) and placed it on the other side of the equation, like this:

Isn't it possible to solve it like this? :?

why did you use the inverse ??

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

Thanks.
The question had two correct responses. Either p and q are 3 and 4 or they have the values 2 and 12. I wonder if there's a way to get the latter answer, too.

ur right bro and really got me thinking. personally i think the only way to get 2 and 12 is through trial and error, i might be wrong though so ill keep thinking.

Yeah I think it would be by trial and error, too.

 

[SalmanPakRocks]

Re: O'level Maths, Addmaths and Statistics help available he

can any one answer this that why did @Leosco1995 used inverse function ? ?

 

[rafay malik]

Re: O'level Maths, Addmaths and Statistics help available he

hey. could any one help me with a relative velocity question.pls.
its of *june 2000 p2.*
kindly confirm the answers to me, as the marking schme isnt available on this site.
thanx

 

[HarisShahzad]

Re: O'level Maths, Addmaths and Statistics help available he

sorry bro, could u post link cuz june 2000 isnt on xtremepapers

 

[OakMoon!]

Re: O'level Maths, Addmaths and Statistics help available he

@ rafay malik: You need to post the link, here.

 

[leosco1995]

Re: O'level Maths, Addmaths and Statistics help available he

June 2000 P2 Q12?
(a) (i) 77.6°
(ii) 282.4°
(ii) 4.7 hours
(b) (i) 416.4km/hr
(ii) 543.6 km/hr

Those are just the answers from the solved past paper book I have.. not really sure if they are right.

 

[OakMoon!]

Re: O'level Maths, Addmaths and Statistics help available he

Looking forward to more queries.

 

[leosco1995]

Re: O'level Maths, Addmaths and Statistics help available he

Don't worry, this thread might be flooded with them in late May/early June, haha.

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

I am looking forward to them, too!

 

[Usman17]

Re: O'level Maths, Addmaths and Statistics help available he

Great work

 

[leosco1995]

Re: O'level Maths, Addmaths and Statistics help available he

Can someone solve this question for me?

Two ships, A and B, leave their ports simultaneously at 12 00 hours. The ports are 104 km apart with one port due west of the other. The speeds and directions of the two ships are shown in the diagram, where tan x = 3/4 and tan y = 12/5. Find:

a) The speed and direction of the velocity of A relative to B;
b) The time at which A is due south of B and the distance between A and B at this instant;
c) The distance between the two ships at 17 00 hours.

Thanks in advance!

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

AoA!
I've found a lecture on a similar problem. Check this out: http://www.numberskill.com/lessons-publ ... ity-part3/
Click on example 1 when it's loaded. The full explanation is given and I hope that makes you understand. Do let me know please.

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

These are the links to all relative velocity lessons that are included in O-level Add-Maths syllabus. I understood it from here (my teacher did not teach me). I hope they prove highly useful to you,too.
1. http://www.numberskill.com/lessons-publ ... ity-part1/
2. http://www.numberskill.com/lessons-publ ... ity-part2/
3. http://www.numberskill.com/lessons-publ ... ity-part3/
4. http://www.numberskill.com/lessons-publ ... ity-part4/

 

[Usman17]

Re: O'level Maths, Addmaths and Statistics help available he

The question that you mentioned LEOSCO is not in the syllabus... I repeat 24.3 of the add maths book is not part of the new syllabus so dont bother studying it...!!

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

It was part of the syllabus till November 2010. In fact, a question on it even came in that paper. Did the syllabus change after that?

 

[OakMoon!]

Re: O'level Maths, Addmaths and Statistics help available he

@Leosco1995: abcde has provided perfect links to learn relative velocity. Look at them and try to solve this question. I am telling you to do this because when you will exert yourself and try harder to do this question, you will get the concepts better. But if you are still unable to solve this question, tell me. I'll try to explain.