24. Let $\rho_{ Al }$ represent the density of aluminum and $\rho_{ Fe }$ that of iron. Find the radius of a solid aluminum sphere that balances a solid iron sphere of radius $r_{ Fe }$ on an equal-arm balance.
24. Let $\rho_{ Al }$ represent the density of aluminum and $\rho_{ Fe }$ that of iron. Find the radius of a solid aluminum sphere that balances a solid iron sphere of radius $r_{ Fe }$ on an equal-arm balance.
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