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Can be anything reasonable that indicates a shift in demand, e.g. greater perceived returns to education. Incorrect answers are supply-side based answers, e.g. Government makes the cost of University chea...

Perfect substitute could be anything like: Pepsi and Coca-Cola, PG Tips and Typhoo etc. Imperfect substitute can be things like: Tea and Coffee, Beer and Wine.

Estimate, so: 900 litres, and 20 litres per day. 900/20 = 45 However, any estimation that results in an answer between 44-56 is acceptable.

Everyone learns differently, but for the ELAT I would suggest a few things as key to anyone's preparation. First and foremost it is important to make sure you are comfortable with unseen passages, and ana...

• multiply everything by 5, so you get 6y - 30 = 10x + 12 - add 30 to both sides, so you get 6y = 10x + 42 - divide everything by 6, so you have y = (10/6)x + (42/6) - simplify, y= (5/3)x + 7 - this i...