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lukybear, since you know what a and c is, you want to find the LCM of b (common value that they both divide in) - so it is 12. You times the 1st fraction by 4 then to get 8:12, and then times the second one by 3 to get 12:15.Lukybear said:In one of the papers 2007 i think theres this question
Given a:b = 2:3
and b:c = 4:5
what is a:c
a 1:2
b 2:5
c 3:5
d 8:15
the answer is d but how??
isnt is 18:25...
you mean, 8:15lookoutastroboy said:lukybear, since you know what a and c is, you want to find the LCM of b (common value that they both divide in) - so it is 12. You times the 1st fraction by 4 then to get 8:12, and then times the second one by 3 to get 12:15.
Now that you've got a common value for b (12), the answer is 8:12. d.
Just look at this and see where you got it wrong:Lukybear said:but isnt what they asking 2/5 : 5/9
where did i read it wrong?
This might be easier to understand:Lukybear said:In one of the papers 2007 i think theres this question
Given a:b = 2:3
and b:c = 4:5
what is a:c