exam Maths Puzzle Numerical Ability

6x+5y=1

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If I am given 43 minutes to complete a task at work, and I complete it in 43 minutes I would have performed the task at 100%. Now if I am able to complete the task at 145% how many minutes would it have taken me to complete the assignment?
An outboard engine uses a gasoline-oil fuel mixture in the ratio of 15 to 1. How much gasoline must be mixed with a gasoline-oil mixture, which is 75% gasoline, to make 8.0L of the mixture for the outboard engine?