exam Maths Puzzle Numerical Ability

i need help solving this:
(x-radical y-z)-(x+radical y-z)-(radical y+z-x)

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exam Other Question

Mrs. Bernado owed 670 pesos on her bank credit card. She charged another item costing 1,070 pesos. Find the amount that Mrs. Bernado owed the bank. Can someone help me with this this problem?
This formula for calculating the amount of money returned for an initial deposit into a bank account or CD (certificate of deposit) is