book Maths Puzzle Numerical Ability

How many gallons of a 15% acid solution must be mixed with 2 gallons of a 23% acid solution to make a 18% acid solution?

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Hi, please help!

I am trying to solve the system of linear inequalities by graphing, however, I cannot locate an example on this problem:

x + 2y is less than or equal to 3
2 I am trying this problem solve -5/4x+1/4x=2x+1/2=3/4x and I am very confused.