Two boxes-cubes

Two boxes cube with edges a=28 cm and b = 92 cm is to be replaced by one cube-shaped box (same overall volume). How long will be its edge?

Correct answer:

x =  92.8565 cm

Step-by-step explanation:

a=28 cm b=92 cm  V=a3+b3=283+923=800640 cm3 V=x3  x=3V=3800640=92.8565 cm

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