Question 209151
A survey showed that the ratio of telephones to people in the world was 1:8.
 Of the world's telephones 0.012% were in Ethopia. 
In ethopia 0.2% of the population had telephones. 
At the time of the survey there were 4000 million people in the world. 
What was the population of Ethopia?
;
let p = population of Ethiopia
:
Find out how many telephones in the world (in millions)
:
{{{1/8}}}*4000 = 500 million telephones
:
It says,"the world's telephones 0.012% were in Ethiopia." therefore
Change .012% to decimal
.00012 * 500,000,000 = 60,000 telephones
:
It says,"In Ethiopia 0.2% of the population had telephones.", therefore:
Change .2% to decimal
.002p = 60000
p = {{{60000/.002}}}
p = 30,000,000 people