exam Maths Puzzle Numerical Ability

What is the answer to a+b/a-b + a-b/a+b - b-a/a-b + b-a/a+b?

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exam Other Question

The formula t=m+0.06m gives the total cost t for a meal that has a menu price m dollars and has a 6% tax and 15% tip. Use the formula to find the total cost for meal with a menu price of $14.20. How many diagonals does an octagon have? a nonagon? Explain