exam Maths Puzzle Numerical Ability

if a^3+b^3+c^3-3abc=0, does it mean that a+b+c=0?

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exam Other Question

The diameter of the Milky Way disc is approximately 9 x 10^20 meters. How long does it take light, traveling at 10^16 m/year to travel across the diameter of the Milky Way?

900
How is dividing a polynomial by a binomial similar to or different
from the long division you learned in elementary school? Can understanding how to do one kind
of division help