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sixty.    Just use a calculator....

Hey there, Guest!

You prob already saw EP's answer; I agree, you could use a calculator, but I'll walk you step-by-step through this instead.

$30^3=27000\rightarrow$$\sqrt[3]{27000+40^3+50^3}$

$40^3=64000\rightarrow$$\sqrt[3]{27000+64000+50^3}$

$50^3=125000\rightarrow$$\sqrt[3]{27000+64000+125000}$

$\mathrm{Add\:the\:numbers:}\:27000+64000+125000=216000\rightarrow$$\sqrt[3]{216000}$

$\mathrm{Factor\:the\:number:\:}\:216000=60^3\rightarrow$$\sqrt[3]{60^3}$

$\mathrm{Apply\:radical\:rule}:\quad \sqrt[n]{a^n}=a$ and then we get our answer, 60.

Hope this helped! :)

( ﾟдﾟ)つ Bye