maths 2007 may june paper 4....need help

[zubair_slipknot]

hey everybody
i was having a problem in the may june paper 4 2008 question no.1 (the ratio one of Cairo and Addis Ababa)
can someone help me out in this even though i am good at maths i dunnno why i am not getting it ryt...

1(a) The scale of a map is 1:20 000 000
       On the map, the distance between cairo and Addis Ababa is 12cm.

(i)  Calculate the distance,in Km, between Cairo and Addis Ababa.

(ii)  On the map the area of a desert regionis 13 square centimetres
      Calculate the actual area of this desert region, in square Km

(b) (i) The actual distance between Cairo and Khartoum is 1580Km.
         On a diffrent map this distance is represented by 31.6cm.
         Calculate, in the form 1:n, the scale of this map.
thx for help and support if anyone can do this as soon as possible...

[sweetsh]

I will leave the place to Astar to answer you

[astarmathsandphysics]

I am on a mobile phone now so someone else have a go.

[twilight]

can u post the link for the paper .. i dont know what xam it is ...because i need to get the  marking scheme to check my answers before posting them 2 u .. i answered them but just need to check  .. and then i'll post my answers back 2 u 

[zubair_slipknot]

for sure...certainly but it would just take a while cz i am having a hard copy of it
thx for your help

[zubair_slipknot]

http://www.planet-master.com/Cambridge_IGCSE/0580_s07_qp_4.pdf

[sweetsh]

You should know that the scale is in cms..So the ratio is
i)1:20 000 000
12:x
x=240 000 000 cm
=2400km
ii)area will be (1)² : (20 000 000)²
                    13:y
y=5.2*10¹⁵ cm²
=52000 Km²

b)i)1 : 5 000 000
 n = 5 000 000

[zubair_slipknot]

thankyou very much for your help...i wanted to knw this badly...curious about it!!!!

[sweetsh]

You welcome