Question:The marks obtained by Praveen and Vijay are in the ratio of `4 : 5`and those obtained by Vijay and Suresh are in the ratio of `3 : 2`. The marks obtained by Praveen and Suresh are in the ratio of : 

A `2 : 1` 
B `5 : 3` 
C `6 : 5` 
D `5 : 6` 

+ Answer
C 

+ Explanation
`P : V = 4 c: 5` and 

`V : S = 3 : 2`

`P/V = 4/5` and `V/S = 3/2`,

so, `P/S = P/V xx V/S`

`= 4/5 xx 3/2`

`= 6/5`.

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