Question:A sum of Rs.`1550` was lent party at `5%` and party at `8%`p.a. simple interest. The total interest received after `3` years was Rs. `300`.The ratio of the money lent at `5%` to that lent at `8%` is : 

A `8 : 5` 
B `5 : 8` 
C `31 : 6` 
D `16 :15` 

+ Answer
D 

+ Explanation
Let the sum at `55%` be.Rs.x.Then,

`(x xx 5 xx 3)/100 + (1550 - x) xx 8 xx 3)/100 = 300`

`or x = 800`

`:. (Money at 5%)/(Money at 8%)`

`= 800/(1550 - 800)`

`= 800/750`

`= 16/15`

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