book Maths Puzzle Numerical Ability

what is a vairable

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Show that for s (semiperimeter), r(radius of inscribed circle), and R (radius of circumscribed circle), abc = 4srR. Please help me with these questions. Thankyou

1.the health food store wants to make a mix of MnM and peanuts for a trail mix.The Mnms cost $4 a pound and the peanuts cost $10 a