book Maths Puzzle Numerical Ability

How do I add these rational expressions? 2 / y - 1 + 2 / y + 1 ?

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9. McKay Corporation is trying to improve its inventory control system and has installed an on-line computer at its retail stores. McKay anticipates sales of 75,000 units per year A rectangulal pool 10m by 7m is surrounded by a concrete path 50cm wide 25cm thick.how much concrete was used to make the path