exam Maths Puzzle Numerical Ability

A college survey was taken to determine where students study. Of 107 students surveyed, 67 studied in the library, 55 studied in the student union, 21 studied in both the library a

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I need help setting up an equation for the following question:

A 20L solution is 15% alcohol. How much water must be added to make it an 8% alcohol solution? please to solve this equation written as follows:consider:(x^-4)(x+y+1)and x<-2.
since x<-2,what can your say about(x^-4)?