exam Maths Puzzle Numerical Ability

please help me I don't understand 79+v225-23=

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Simplify and evaluate:
(2(2)x5y-3z(4)/4(0)x-2y-8z(5))3 if density of gold is 19.3g/mL and the density of silver is 10.5g/mL devise and experiment to determine the metal in each object