Question:Madhuri had `85`currency notes in all, some of which are of Rs `100` denomination and the remaining of Rs `50`denomination.The total amount of all these currency notes was Rs `5000`.How much amount (in Rs) did she have in the denomination of Rs `50`. 

A `3500` 
B `70` 
C `1500` 
D None of these 

+ Answer
B 

+ Explanation
Let the number of `50`rupee notes `= x`

Then, the number of `100`-rupee notes 

`= (85 - x)`.

`50x + 100 (85 - x) = 5000`

`or x + 2 (85 - x)= 100`

`or x = 70`

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