book Maths Puzzle Numerical Ability

What is the Fahrenheit temperture when converting this Celsisu formula

F=9/5C + 32

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book Other Question

I have to solve each of the following systems of linear inequalities graphically and I cannot figure it out. These are the three inequalities 3x-y is less than/equal to 6, and x is how many liters of 12% salt solution must be added to 10 liters of 25% salt solution to get a 20% salt solution