exam Maths Puzzle Numerical Ability

I need to formnulate 3 word problems (from day to day life) that can be translated into linear equations in one variable, two variables and 3 variables.

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exam Other Question
Given f(x) = -x - 3, find f(a - 2). Solve the following system of linear inequalities by graphing.
x + 2y =3
2x – 3y = 6