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23) See below
As three are joined
3l^3= 729cm^3
l^3= 729cm^3/3
l^3= 243cm^3
![l = \sqrt[3]{243}](https://tex.z-dn.net/?f=l+%3D++%5Csqrt%5B3%5D%7B243%7D+ "l = \sqrt[3]{243}")
l=6.24cm
Surface area= 6l^2
= 233.6cm^2
22) Volume of brick= 9m×8m×25m
=1800m^3
Volume of block= 20m×18m×10m
=3600m^3
Block required= 3600/1800=2blocks
As three are joined
3l^3= 729cm^3
l^3= 729cm^3/3
l^3= 243cm^3
l=6.24cm
Surface area= 6l^2
= 233.6cm^2
22) Volume of brick= 9m×8m×25m
=1800m^3
Volume of block= 20m×18m×10m
=3600m^3
Block required= 3600/1800=2blocks
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