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1 solution
its solution is based on observation 9³ = 729 → 7 + 2 + 9=18 (18*1=18).
99³ = 970299 → 9 + 7 +0 + 2 + 9 + 9=36 (18*2=36).
999³= 997002999→ 9+ 9+ 7+2+9+9+9=54 (18*3=54).
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(9999999999)³= 18*10=180.
Therefore the answer is 180.