book Maths Puzzle Numerical Ability

14r-8=22+20r

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book Other Question

Sally was given 5 cents for each test she passed,
but she had to return 10 cents for every test she
failed. At the end of the trimester, Sally passed
4 times as many tests as s I dont understand how to get the answers to 8^(5/3) and 27^(4/3)