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A sample has A:B as 15:21. What will be its simple ratio?

Answer and explanation

Correct answer: 5:7

The greatest common divisor of 15 and 21 is 3. Dividing both terms by 3 gives 15:21 = 5:7, so option A is correct. The ratio 7:5 reverses the terms, while 3:7 and 5:3 are not equivalent to the given ratio. Exam tip: simplify a ratio by dividing both terms by their greatest common divisor.

Related tags

Ratio SimplificationChemical CompositionBasic ChemistryLaw Of Chemical CombinationClass 11 ChemistryLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistry

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