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okay so we have a microwave oven which has a third off the normal price and the sale price is 90 quid and a combination oven forty percent off the normal price and the sale price is 84 quid which of these two has the higher normal price okay so were going to use the skill here of converting English into maths were going to construct an equation out of this information very important skill so 1/3 off the normal price so were trying to find the normal price so that means we need to introduce our own variable to represent the normal price lets use n capital n okay now 1/3 off the normal price gives you the sale price so 1/3 off a normal price equals 90 theres our equation okay so youve got the normal price okay and were taking 1/3 of that away so were subtracting 1/3 of the normal price so the full normal price minus 1/3 of the normal price thats 1/3 off equals the sale price which is 90 quid there weve done it weve got our equation that we can work out the normal price from t