Exam-Style Question on Ratio Simultaneous Equations
A mathematics exam-style question with a worked solution that can be revealed gradually
Question id: 178. This question is similar to one that appeared on a GCSE Higher paper (specimen) for 2017. The use of a calculator is not allowed.
The prices of two watches are in the ratio \(a:b\).
When the prices are both increased by £10, the ratio becomes \(5 : 7\).
When the prices are both reduced by £10, the ratio becomes \(1 : 3\).
Express the ratio \(a:b\) in its lowest terms.
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This problem can be solved using a technique that you can practise in the self-checking interactive exercises called Simultaneous Equations.
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