SSC CGL Tier II 21 Sep 2014 Paper

Question : 85 of 100

Marks: +1, -0

If each side of a cube is increased by 10% the volume of the cube will increase by

Solution:

(3) Single equivalent increase for 10% and 10%

= (10+10+ {10 ×10}/{100} ) \%=21 \%

Again, single equivalent increase for 21% and 10%

= (21+10+ {21 ×10}/{100} ) \%

=31+2.1=33.1 \%

Note : Volume of cube = (Edge)

^{3}

Hence, formula

(x+y+ {x y}/{100} ) \%

should be used twice

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