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Firstly you would analyse the cost of the melons in the first shop per kg. So you could buy 2 melons for £2 because they're buy one get one free and each weighs 2kg so therefore you're getting 4kg of melo...

This is an exapmle of the addition rule as part of the logorithm syllabus. 

The general rule is log_ab + log_ac = log_a(b*c)

When the base of the logarithm is t...

The question is asking us to simplify; in particular, we have to simplify a fraction. We simplify a fraction by cancelling a factor from both the numerator and the denominator. We can apply this algebraic...

Finding what Emma paid for her radio £78 / 1.3 = £60 (M1) (A1)

Finding what percentage of £80 that is £60 / £80 = 0.8 or 80% (M1)

Recognising the discount is 20% ie. 1-0.8=0.2 (A1)

If the ratio is 2 : 3 then in a class of 5 there would be 2 boys and 3 girls. 

So we can say that 2/5 of the class are boys and 3/5 of the class are girls. 

And we know that to calculate 3/5...