Question:Given that `1` cu. cm of marble weighs `25` gms, the weight of a marble block `28` cm in width and`5` cm thick is `112` kg. The length of the block is : 

A `36 cm` 
B `40 cm` 
C `32 cm` 
D `26.5 cm` 

+ Answer
C 

+ Explanation
Let length = x cm.

Then` x xx 28 xx 5 xx 25/1000`

`= 112`

`:. x = (112 xx 1000/25 xx 1/28 xx 1/5) cm`

`= 32 cm.`

`:. Length of block = 32 cm`.

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Irin Moni

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