Melting 3 cubes

The sides of the three metal cubes are 30 cm, 40 cm, and 50 cm, respectively. Find the side of the new cube formed by melting these cubes together.

Correct answer:

x =  60 cm

Step-by-step explanation:

a=30 cm b=40 cm c=50 cm  V1=a3=303=27000 cm3 V2=b3=403=64000 cm3 V3=c3=503=125000 cm3  V=V1+V2+V3=27000+64000+125000=216000 cm3  V = x3  x=3V=3216000=60 cm

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