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  1. March 8th 2006, 11:50 PM #1
    bharathlece
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    urgent

    spherical brass balls of radius 6, 8 , x cms are melted and form a brass ball of

    radius 27 cms . then what is x?
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  2. March 9th 2006, 04:28 AM #2
    topsquark
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    Quote Originally Posted by bharathlece
    spherical brass balls of radius 6, 8 , x cms are melted and form a brass ball of

    radius 27 cms . then what is x?
    For a sphere V=\frac{4}{3} \pi r^3. You can write an expression for the total volume of the three spheres, since volumes simply add, then equate that to an expression for the volume of a single sphere:
    \frac{4}{3} \pi (6)^3+\frac{4}{3} \pi (8)^3+\frac{4}{3} \pi (x)^3=\frac{4}{3} \pi (27)^3.

    Solve for x.

    -Dan
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