Self Maths Puzzle Numerical Ability

if a+b+c=0
then find the value of a^3 + b^3 + c^3 - 3abc

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Self Other Question

A SHOPKEEPER SOLD AN ARTICLE AT A GAIN OF 5%.IF HE HAD SOLD IT FOR RS.16.50 LESS,HE WOULD HAVE LOST 5%.FIND THE COST PRICE OF THE ARTICLE. if a+b+c = 0
then find out,
a^3+b^3+c^3 -3abc = ?