book Maths Puzzle Numerical Ability

(-10p)(-8q)(-r)

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I have this really hard question that I can't work out, and even though you might not find it hard...I DO! Anyways, here is the question

For what values of a are there exactly 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