exam Maths Puzzle Numerical Ability

1/x-8/21=3/7x Thank you!

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exam Other Question

If Earthquake 1 measures 6.2 on the Richter scale, and Earthquake 2 measures 8.2 on the Richter scale, how many times bigger was Earthquake 2 than Earthquake 1? (Rephrased: By what factor was Earthquake 2 bigger than Earthquake 1?) how do I solve the equation .04x + .16y = 60.