Question:The value of `36`coins of `10`p and `20`p is Rs `6.60`.The number of `20` p coins is : 

A `16` 
B `20` 
C `28` 
D `30` 

+ Answer
D 

+ Explanation
Let the number of `20`paise coins be x.

Then,number of `10` paise coins `= (36 - x).

`10 (36 - x) + 20x = 660`

`or 10x = 300`

`or x = 30`.

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Irin Moni

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