Finding the original quantity

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Presentation transcript:

Finding the original quantity Reverse Percentage or Finding the original quantity

Reverse Percentage Example: 54% of the adults living on a street own a car. If 162 adults own a car, how many adults live in this street? 162 54  54 3 1 x 100 300 100

Reverse Percentage Example: 65% of the pages in a magazine are coloured. If there are 52 coloured pages, how many pages altogether? 52 65  65 0.8 1 x 100 80 100

Reverse Percentage Example: A bookseller makes 30% on a book and sells it for £9.10. What did she pay originally? 9.10 130  130 0.07 1 x 100 7 100

Reverse Percentage There are 18 soft-centred chocolates in a box. This is 72% of the total. How many in the box altogether? 12.5% of Fred’s phone calls (9) were not from his friends. How many calls altogether. A second-hand car is priced at £6440. If it’s value has depreciated by 15%, how much was it worth new? Some trousers were increased by 20% to £36. What was their original cost.