Maths Paper 4.. " How On Earth" DOUBTS QUESTIONS!

[dubi2pro]

Please solve these..

 

[dubi2pro]

ahmadumar or anyone solve it!

 

[SoulSlayer]

this is not my math paper 4 subject code
:/

 

[dubi2pro]

this is not my math paper 4 subject code
:/

Its from the retired maths igcse CIE. many many questions are included in this as well..

 

[Hello090078601]

Hi, I don't know how this works because I'm new here but I've been stuck on a mathematical question for like the past hour and it's driving me insane.

My Math IGCSE is in three days.
Anywho, this question is from October/November 2013, Paper 43 Question 1b.

The question is:

In a car magazine, 25% of the pages are used for selling second-hand cars, 62.5% of the remaining pages are used for features and the other 36 pages are used for reviews.

Work out the total number of pages in a magazine.

NEED HELP ASAP.

 

[Hello090078601]

This is the process:
25+62.5= 87.5% <---so u know only 87.5% of the magazine is used for cars+features
100-87.5=12.5% <--- The amount of pages used for reviews as a percentage of the magazine
(12.5÷100)x=36
x=36/(12.5÷100)
x=288 <---Answer (i hope its right!)

Hi! Thanks for replying to my thread. What you did, made sense to me but in the mark scheme the final answer is 128 :/ Why? I took a screenshot and uploaded it, I'd be grateful if you could maybe check it out and hopefully figure out why it's 128 cuz apparently I'm horrible at math

 

[babooshka]

Hi! Thanks for replying to my thread. What you did, made sense to me but in the mark scheme the final answer is 128 :/ Why? I took a screenshot and uploaded it, I'd be grateful if you could maybe check it out and hopefully figure out why it's 128 cuz apparently I'm horrible at math

Damn it! Sry! i'll check it out

 

[Hello090078601]

Damn it! Sry! i'll check it out

Lol, no need to apologize. They do show 288 at the right hand column but the final answer is written as 128. (P.S. Don't you just hate math?)

 

[FlameBlazer69]

Wait a sec that was jus plain common sense. ._. sorry I wasn't able to help out :/

 

[Kshitij_2511]

Hi, I don't know how this works because I'm new here but I've been stuck on a mathematical question for like the past hour and it's driving me insane.

My Math IGCSE is in three days.
Anywho, this question is from October/November 2013, Paper 43 Question 1b.

The question is:

In a car magazine, 25% of the pages are used for selling second-hand cars, 62.5% of the remaining pages are used for features and the other 36 pages are used for reviews.

Work out the total number of pages in a magazine.

NEED HELP ASAP.

100% -25 % = 75%
(62.5/100)*75 = 46.875%(total percentage of features)
25%(second hand cars)+46.875%(features)=71.875%
36 remainder pages = (100-71.875)% = 28.175%
28.125% - 36
100% - x
x = (36*100)/28.125
x = 128

 

[babooshka]

100% -25 % = 75%
(62.5/100)*75 = 46.875%(total percentage of features)
25%(second hand cars)+46.875%(features)=71.875%
36 remainder pages = (100-71.875)% = 28.175%
28.125% - 36
100% - x
x = (36*100)/28.125
x = 128

ahhhhhh... so thats how u get it! it confused me for 5 mins!

 

[Hello090078601]

100% -25 % = 75%
(62.5/100)*75 = 46.875%(total percentage of features)
25%(second hand cars)+46.875%(features)=71.875%
36 remainder pages = (100-71.875)% = 28.175%
28.125% - 36
100% - x
x = (36*100)/28.125
x = 128

Umm, I'm confused :s What do you mean by 'total percentage of features'? Wasn't that given as 62.5? For features?? Why did you multiply it with 75? Because if you are subtracting 100 from 25%, Shouldn't you multiply with 75% instead of just 75? God, I'm so flustered atm.

 

[Kshitij_2511]

Umm, I'm confused :s What do you mean by 'total percentage of features'? Wasn't that given as 62.5? For features?? Why did you multiply it with 75? Because if you are subtracting 100 from 25%, Shouldn't you multiply with 75% instead of just 75? God, I'm so flustered atm.

They say that from the remaining 75%, 62.5% are for features...

 

[babooshka]

Umm, I'm confused :s What do you mean by 'total percentage of features'? Wasn't that given as 62.5? For features?? Why did you multiply it with 75? Because if you are subtracting 100 from 25%, Shouldn't you multiply with 75% instead of just 75? God, I'm so flustered atm.

It said '62.5% of the REMAINING pages' so you have to multiply what ever percentage was left over by the second hand cars by the features which will give you the actual percentage of the features... rest is pretty simple

 

[Kshitij_2511]

Btw, in the same paper, can someone explain to me question number '9cii'?

 

[Hello090078601]

They say that from the remaining 75%, 62.5% are for features...

Omg! I'm so stupid I thought that you were just multiplying it with 75 and not 75% but then my slow brain acknowledged that you wrote 46.875 '%'. Omg, I assure you I'm not this thick headed when it comes to other subjects

Thanks for your help guys

 

[Hello090078601]

Btw, in the same paper, can someone explain to me question number '9cii'?

Omg, Even 9 cii looks hard, I have yet to solve that :/ I hope either the variant I'm gonna give I find easy or the threshold is really low :c

 

[babooshka]

Btw, in the same paper, can someone explain to me question number '9cii'?

Simultaneous equations maybe... they have given p+q=8.5 in c(i) and the other equation is probably when you substitute any number in the first equation... uhh... maths...

 

[The Chill Master]

Please solve these..

can u please specify which part

 

[Kshitij_2511]

Simultaneous equations maybe... they have given p+q=8.5 in c(i) and the other equation is probably when you substitute any number in the first equation... uhh... maths...

tried it .