exam Maths Puzzle Numerical Ability

How do you solve this equation:
(-5)divided by 3+=7

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exam Other Question

An operation has a 10 percent scrap rate. As a result, 72 pieces per hour are produced. What is the potential increase in labor productivity that could be achieved by eliminating the scrap? How would you solve (5a^3b^5)^1/3 X ^3 square root sign 4a^4b?