Applications of Ratio and Proportion

Mathematics — First Preparatory

Common mistakes

Forgetting to convert the units before using a drawing scale, which gives a wrong answer.
Using the price after the discount instead of the discount amount, or the other way round.
Dividing the quantity by one part only, instead of by the total number of parts.
Confusing a percentage with the number itself. 25% of 480 is 120, not 25.

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