exam Maths Puzzle Numerical Ability

How much pure acid should be mixed with 7 gallons of a 40% acid solution in order to get an 80% acid solution?

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Can someone please help me.
Line passing through (-10,-1) and (-8,y) is perpendicular to a line with a slope of -2/9. What is the value of y.

Thank you. I do not have a question from the book. I have a linear inequality of 5x + 10 y <= 100

Could you tell me how to graph this inequality? Thank you.