exam Maths Puzzle Numerical Ability

(X-5) TO THE SECOND POWER (X-1) WHEN X = 3. evaluate each expression

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A health food store mixes granola that costs them $4 per pound and raisins that cost them $2 per pound together to make 25 pounds of raisin granola. How many pounds of each do they need to produce a mixture that costs them $80? Hi. Can I have some help with the following problem?

Boyle's Law states that the pressure P of a sample of gas is directly proportional to the temperature T and inversely propor