exam Maths Puzzle Numerical Ability

Find an equation for the line with y-intercept 3 that is perpendicular to the line: y=2/3x-4

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I could really use help with this word problem:Stan invested $13000, part at 17% and part at 2%. If the total interest at the end of the year is $1,910 how much did he invest at 17%? An inlet pipe can fill a pool x hours while an outlet pipe can empty it in x+2 hours. If both pipes are open, what fraction of the pool is left unfilled after 1 hour?