Question:`Rs. 180` contained in a box consists of one rupee, `50-`paise and `25-`paise coins in the proportion of `2 : 3 : 4`. What is the number of `50-`paise coins ? 

A `120` 
B `150` 
C `180` 
D `240` 

+ Answer
A 

+ Explanation
Ratio of values `= 2/1 : 3/2 : 4/4`

`= 2 : 3/2 : 1`

`= 4 : 3 : 2`.

Value of `50-`paise coins `= Rs. (180 xx 3/9)`

`= Rs. 60`.

Number of `50-`paise coins `= (60 xx 2)`

`= 120`.

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Md. Habib Ullah

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