exam Maths Puzzle Numerical Ability

please help me solve 2x/7 - 3x/5 = 6/35
please explain how you get
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exam Other Question

Larry invested $6000 for one year. He invested part of it at 9% and the rest at 11%. At the end of the year he earned $624 in interest. How much did he invest at each rate? A chemist needs 90 milliliters of a 78% solution, but has only 43% and 88% solutions available. Find how many milliliters of each should be mixed t oget the desired solution.