exam Maths Puzzle Numerical Ability

Write an algebraic expression, an equation or an inequality.

The difference of 3 times a number x and 11

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exam Other Question

How could I solve equations like these:
8(p-2)>5p+7

And how can this be solved:
∆ABC is isosceles with base BC. If AB=3x+1 cm, AC=2x+5 cm, and BC is=x+11, find the perim 5floz. of a 2% alcohol solution was mixed with 11floz. of a 66% alcohol solution. Find the concentrationof the new mixture.

I need to know how to set the problem up! thanks