Question:An amount of money is to be distributed among `P, Q` and `R` in the ration `3 : 5 : 7`. If `Q`'s share is Rs. `1500`, what is the difference between `p`'s and `R`'s shares ? 

A `Rs. 1200` 
B `Rs. 1500` 
C `Rs. 1600` 
D `Rs. 1900` 

+ Answer
A 

+ Explanation
Let `P = 3x, Q = 5x` and `R = 7x`.

Then, `5x = 1500`

`iff x = 300`.

`:. P = 900, Q = 1500` and `R = 2100`.

Hence, ` (R - P)`

`= (2100 - 900)`

`= 1200`

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