book Maths Puzzle Numerical Ability

how do you find the percent of increase or decrease when the difference or change is a negative number?

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One-third of a number is 5 less than half of the same number. What is the number? I am confused! Please help!
the revenue R from selling x units of a certain product is given by
R=20(20-0.2x)
Find the number of units that must be sold to produce a revenue of