Question 184819
Note: 1 mi=5280 ft
_     1 ft=12 in
Therefore, 1 mi=5280 x 12 in =63360 in
_     1 mi<sup>3</sup>=(1 mi)(1 mi)(1 mi)=(63360 in)(63360 in)(63360 in)=254358061056000 in<sup>3</sup>

Solution:
20 mi<sup>3</sup>=20 (254358061056000 in<sup>3</sup>)=5087161221120000 in<sup>3</sup>
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