Question:If `A : B = 8 : 15`, `B : C = 5 : 8` and `C : D = 4 : 5`, then `A : D` is equal to : 

A `2 : 7` 
B `4 : 15` 
C `8 : 15` 
D `15 : 4` 

+ Answer
B 

+ Explanation
`A/D = (A/B xx B/C xx C/D)`

 `= (8/15 xx 5/8 xx 4/5)`

 `= 4/ 15`.

so, `A : D = 4 : 15`.

+ Report

Md. Habib Ullah

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