Question:A hall 36 m long and 15 m broad is to be paved with stones, each measuring 6 dm by 5 dm. The number of stones required is : 

A `180` 
B `1800` 
C `18` 
D `18000` 

+ Answer
B 

+ Explanation
Area of the hall` = (3600 xx 1500) sq. cm.`

Area of each stone` = (60 xx 50) sq. cm.`

:. Number of stones` = ((3600 xx 1500)/(60 xx 50))`

                              ` = 1800.`

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Irin Moni

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