Question:The dimensions of an open box are `50` cm, `40` cm and `23 cm.` Its thickness is `3 cm.` If `1` cubic cm of metal used in the box weighs `0.5 gms,` the weight of the box is : 

A `8.56 kg` 
B `8.04 kg` 
C `7.576 kg` 
D `6.832 kg` 

+ Answer
B 

+ Explanation
Volume of the metal

`= [(50 xx 40 xx 23) - (44 xx 34 xx 20)] cu. cm.`

`= 16080 cu. cm.`

Weight of the metal 

`= ((16080 xx 0.5)/1000) kg`

`= 8.04 kg.`

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Irin Moni

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